Fix grammar problems in readme. (piotrwitek#89)

* Fix grammar problems in readme.

* Modify .md files for grammar fixes.

Author: flymason

Diff for: README.md

@@ -4,7 +4,7 @@ _"This guide is a **living compendium** documenting the most important patterns
 
 [![Join the chat at https://gitter.im/react-redux-typescript-guide/Lobby](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/react-redux-typescript-guide/Lobby)  
 
-> #### _Found it usefull? Want more updates?_ [**Show your support by giving a :star:**](https://github.com/piotrwitek/react-redux-typescript-patterns/stargazers)  
+> #### _Found it useful? Want more updates?_ [**Show your support by giving a :star:**](https://github.com/piotrwitek/react-redux-typescript-patterns/stargazers)  
 
 > _[The Mighty Tutorial](https://github.com/piotrwitek/typesafe-actions#behold-the-mighty-tutorial) for completely typesafe Redux Architecture_ :book:  
 
@@ -14,7 +14,7 @@ _"This guide is a **living compendium** documenting the most important patterns
 
 ### Goals
 - Complete type safety (with [`--strict`](https://www.typescriptlang.org/docs/handbook/compiler-options.html) flag) without losing type information downstream through all the layers of our application (e.g. no type assertions or hacking with `any` type)
-- Make type annotations concise by eliminating redudancy in types using advanced TypeScript Language features like **Type Inference** and **Control flow analysis**
+- Make type annotations concise by eliminating redundancy in types using advanced TypeScript Language features like **Type Inference** and **Control flow analysis**
 - Reduce repetition and complexity of types with TypeScript focused [complementary libraries](#complementary-libraries)
 
 ### Complementary Projects
@@ -25,8 +25,8 @@ _"This guide is a **living compendium** documenting the most important patterns
 ### Playground Project
 [![Codeship Status for piotrwitek/react-redux-typescript-guide](https://app.codeship.com/projects/11eb8c10-d117-0135-6c51-26e28af241d2/status?branch=master)](https://app.codeship.com/projects/262359)
 
-You should check Playground Project located in the `/playground` folder. It is a source of all the code examples found in the guide. They are all tested with the most recent version of TypeScript and 3rd party type definitions (like `@types/react` or `@types/react-redux`) to ensure the examples are up-to-date and not broken with updated definitions.
-> Playground was created is such a way, that you can simply clone the repository locally and immediately play around on your own to learn all the examples from this guide in a real project environment without the need to create some complicated environment setup by yourself.
+You should check out Playground Project located in the `/playground` folder. It is a source of all the code examples found in the guide. They are all tested with the most recent version of TypeScript and 3rd party type definitions (like `@types/react` or `@types/react-redux`) to ensure the examples are up-to-date and not broken with updated definitions.
+> Playground was created in such a way that you can simply clone the repository locally and immediately play around on your own. It will help you to learn all the examples from this guide in a real project environment without the need to create some complicated environment setup by yourself.
 
 ### Contribution Guide
 [CONTRIBUTION.md](/CONTRIBUTION.md)
@@ -101,7 +101,7 @@ const MyComponent: React.SFC<MyComponentProps> = ...
 [⇧ back to top](#table-of-contents)
 
 #### `React.Component<P, S>`
-Type representing statefull class component
+Type representing stateful class component
 ```tsx
 class MyComponent extends React.Component<MyComponentProps, State> { ...
 ```

Diff for: docs/markdown/1_react.md

@@ -8,7 +8,7 @@ const MyComponent: React.SFC<MyComponentProps> = ...
 [⇧ back to top](#table-of-contents)
 
 #### `React.Component<P, S>`
-Type representing statefull class component
+Type representing stateful class component
 ```tsx
 class MyComponent extends React.Component<MyComponentProps, State> { ...
 ```

Diff for: docs/markdown/_intro.md

@@ -4,7 +4,7 @@ _"This guide is a **living compendium** documenting the most important patterns
 
 [![Join the chat at https://gitter.im/react-redux-typescript-guide/Lobby](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/react-redux-typescript-guide/Lobby)  
 
-> #### _Found it usefull? Want more updates?_ [**Show your support by giving a :star:**](https://github.com/piotrwitek/react-redux-typescript-patterns/stargazers)  
+> #### _Found it useful? Want more updates?_ [**Show your support by giving a :star:**](https://github.com/piotrwitek/react-redux-typescript-patterns/stargazers)  
 
 > _[The Mighty Tutorial](https://github.com/piotrwitek/typesafe-actions#behold-the-mighty-tutorial) for completely typesafe Redux Architecture_ :book:  
 
@@ -14,7 +14,7 @@ _"This guide is a **living compendium** documenting the most important patterns
 
 ### Goals
 - Complete type safety (with [`--strict`](https://www.typescriptlang.org/docs/handbook/compiler-options.html) flag) without losing type information downstream through all the layers of our application (e.g. no type assertions or hacking with `any` type)
-- Make type annotations concise by eliminating redudancy in types using advanced TypeScript Language features like **Type Inference** and **Control flow analysis**
+- Make type annotations concise by eliminating redundancy in types using advanced TypeScript Language features like **Type Inference** and **Control flow analysis**
 - Reduce repetition and complexity of types with TypeScript focused [complementary libraries](#complementary-libraries)
 
 ### Complementary Projects
@@ -25,8 +25,8 @@ _"This guide is a **living compendium** documenting the most important patterns
 ### Playground Project
 [![Codeship Status for piotrwitek/react-redux-typescript-guide](https://app.codeship.com/projects/11eb8c10-d117-0135-6c51-26e28af241d2/status?branch=master)](https://app.codeship.com/projects/262359)
 
-You should check Playground Project located in the `/playground` folder. It is a source of all the code examples found in the guide. They are all tested with the most recent version of TypeScript and 3rd party type definitions (like `@types/react` or `@types/react-redux`) to ensure the examples are up-to-date and not broken with updated definitions.
-> Playground was created is such a way, that you can simply clone the repository locally and immediately play around on your own to learn all the examples from this guide in a real project environment without the need to create some complicated environment setup by yourself.
+You should check out Playground Project located in the `/playground` folder. It is a source of all the code examples found in the guide. They are all tested with the most recent version of TypeScript and 3rd party type definitions (like `@types/react` or `@types/react-redux`) to ensure the examples are up-to-date and not broken with updated definitions.
+> Playground was created in such a way that you can simply clone the repository locally and immediately play around on your own. It will help you to learn all the examples from this guide in a real project environment without the need to create some complicated environment setup by yourself.
 
 ### Contribution Guide
 [CONTRIBUTION.md](/CONTRIBUTION.md)