https://github.com/github-for-unity/Unity/pull/74

Moving logic to validate a new branch name to a testable location; Adding unit tests to check boundary conditions

Use OnEnable/OnDisable instead of OnShow/OnHide, it's more consistent with Unity's
naming and our own window class.

AuthenticationView was missing some calls from the window, fixicate.

VS loves to screw around with the csproj format, so move all the custom rules
into separate files that it can't screw around with.

This also gives the added benefit of shutting up the warning about duplicate
AssemblyVersionInformation types, because apparently VS doesn't show files
that are included for compilation from external targets files but it still
includes them in the compilation (bug? feature? shrug)

Add instructions for the GitHub.Unity.OctokitDebugging solution

Add mono-built versions of octokit and dotnet-http.
Octokit: 0.23.0.1
dotnet-httpClient35: 3.5.0.0 (3.5.22000.1-gfu)

- Make authentication window into a utility window (non-dockable).
- Force constant size.
- Shrink gap between label and
text field.
- Rename authentication window title to Authentication to match menu
item.
- Remove unused fields.
- Enable wordwrap for errors.
- Use title capitalization for labels.