Update Project Directories

[bcylin]

Previously the project is using the default setup generated via pod lib create, which has a nested project layout:

.
├── Example
│   ├── Pickle.xcodeproj
│   └── Pods
│       └── Pods.xcodeproj
└── Pickle.xcodeproj -> Example/Pods/Pods.xcodeproj  // a symlink for Carthage support

It has a few problems so far:

• xcodeporj and xcworkspace are not in the root directory. Uneasy to find at first glance and it also requires an additional flag when running pod install.
• Pickle.framework is built via CocoaPods. It needs to rerun pod install after source files are changed during implementation.
• Example/Pods/Pods.xcodeproj/project.pbxproj has large diffs whenever CocoaPods regenerates the project.

This pull request moves the project to a single xcodeporj in the root directory with three targets:

• Pickle.framework
• PickleExample.app with the framework as the target dependency
• PickleUITests

It should be simpler and easier to manage than the nested directories.

[carouselljenkins]

@jianyaoang, can you review this pull request?

[carouselljenkins]

	1 Warning
⚠️	Big PR

Generated by 🚫 Danger

[daveluong]

👍 I've experienced all these problems during development of this PR #39

[daveluong]

I have tested and this works perfectly. Merging it now