Use screenshots of IDE terminal

Fixes #15

Author: gj

README.md

@@ -19,35 +19,35 @@ First, we need to practice greeting everyone. (I don't know about you, but I som
 
 One might think that we could just type
 
-``` javascript
+```js
 Hello, everybody!
 ```
 
 in our browser's console and be done with it. Give it a try. (If you're on a Mac, that would be `Command` + `Option` + `J` together.)
 
 You should see something like
 
-``` shell
+```
 Uncaught ReferenceError: Hello is not defined(…)
 ```
 
 Well, that won't work. (This is why we practice!) In order to greet our guests, we need to tell JavaScript that we're using a **string**. A string is a collection of characters (letters, numbers, and symbols) wrapped in single or double quotes (or, as we'll see, in back ticks). So to greet everyone, we can write,
 
-``` javascript
+```js
 'Hello, everybody!'
 ```
 
 or
 
-``` javascript
+```js
 "Hello, everybody!"
 ```
 
 Single or double quotation marks can contain a string variable..
 
 What if we want to say hi to a special guest, like Neil deGrasse Tyson? When we wrap strings in single or double quotes, we can join them together using the `+` operator:
 
-``` javascript
+```js
 var specialGuest = "Neil deGrasse Tyson"
 "Hello, " + specialGuest + "!" // "Hello, Neil deGrasse Tyson!"
 ```
@@ -62,7 +62,7 @@ Alternatively, you can press `ctrl + L` or `command + K`. As long as you don't r
 
 When we wrap strings in back ticks, we can use placeholders (`${}`) and insert variables or evaluated JavaScript directly:
 
-``` javascript
+```js
 var specialGuest = "Neil deGrasse Tyson";
 
 `Hello, ${specialGuest}! High ${3 + 2}!` // "Hello, Neil deGrasse Tyson! High 5!"
@@ -82,7 +82,7 @@ All three tests have failed! This is okay, and it's expected — you haven't wri
 
 In `index.js`, you'll see five lines of code:
 
-``` javascript
+```js
 var greeting = "";
 
 var specialGuest = "Neil deGrasse Tyson"
@@ -98,11 +98,11 @@ Each line has a test associated with it. When the tests fail, they show us what
 
 When you first run `learn`, you should see something like this:
 
-![test fail](https://curriculum-content.s3.amazonaws.com/skills-based-js/javascript-strings-lab/javascript-strings-lab-test.png)
+![All tests failing.](https://user-images.githubusercontent.com/17556281/27979675-b6575498-6345-11e7-8c9d-052c2d4d3e96.png)
 
 Let's walk through that first error together. First, we see the test title:
 
-``` bash
+```bash
 1) strings defines `greeting`:
 ```
 
@@ -112,7 +112,7 @@ we're handling strings.
 
 Continuing on with the test output, we can now make better sense of the next few lines:
 
-``` bash
+```bash
 AssertionError: '!' == 'Hello, everybody!'
 + expected - actual
 
@@ -134,13 +134,13 @@ Next, the title tells us that `index.js` "defines `greeting`." Let's look in `in
 
 What if, instead of assigning `""` to `greeting`, we assign `"Hello, everybody!"`, like the test expects. Go ahead and change that line in `index.js` so it reads
 
-``` javascript
+```js
 var greeting = "Hello, everybody!";
 ```
 
 save the file, and rerun your tests. You should see
 
-![first test passes!](https://curriculum-content.s3.amazonaws.com/skills-based-js/javascript-strings-lab/javascript-strings-lab-test-pass.png)
+![First test passes!](https://user-images.githubusercontent.com/17556281/27979674-b65255f6-6345-11e7-8fca-d71760c514ef.png)
 
 Nice! You got the first test to pass.