Start of blob api
Add tests and interface

Also include stuff in 4.5 and mono csprojs
Add way to get to blob client
set Activity client accessor set to private

this isn't related to implementing the blobs client.  Just noticed it
doesn't match the rest of the properties.
Create ObservableBlobClient and interface
Write tests for observable blob client
Add blob client to ObservableGithubClient
Update monoandroid and monotouch csprojs
Enum Encoding
Implement get command and model classes
Write Create method
Create ITreeClient
Strip '-' from strings coming in to be de-serialized.
Add Tests for Tree Client
Implement Observable Tree client and refactor names
Create Observable Tests
Add to mono and .net4.5 projects
Add to monotouch and monoandroid projects
code review cleanups.
Create now returns blob reference.