Implement Tree Api Client

[pltaylor]

Ready for review. Fixes #132

• Create TreeClient
  • Implement Get
  • Implement Create
  • Create Interface
• Create Tree response model
• Test Tree Client
  • Test Get
  • Test Create
  • Test Serialization
• Create ObservableTreeClient
  • Create Interface
  • Test ObservableTreeClient
• Reference in GitHubClient
• Add files to other projects
  • .Net 4.5
  • Mono
  • MonoAndroid
  • MonoTouch

[pltaylor]

With the latest Fake build do I still need to add the files to the other projects?

[haacked]

With the latest Fake build do I still need to add the files to the other projects?

Not manually. Just run .\script\build.cmd in the root of the repository to fix it up.

[pltaylor]

I did it manually for this PR, but it is fantastic to know I won't have to in the future!!

[shiftkey]

You'll need to merge master into this branch (probably some csproj conflicts yay!)

EDIT: nope, ApiUrls.cs

[shiftkey]

I updated the Mono* files inline and merged this in by hand. Thanks for the work.

[pltaylor]

I'm sorry this needed the mono files updated. I thought I did that.

[shiftkey]

@pltaylor that's okay.

I made a change recently to the script to make it more thorough after some changes slipped through, so it's not your fault.

[pltaylor]

Thanks for the scapegoat...but I did it manually....so the blame, as insignificant as it may be, rests over here.