Modified Octokit project to run custom build task that pulls down
interface comments to implementations.
Updating CustomBuildTask.dll. Changed files are now written as UTF-8
Merge pull request #257 from pmacn/feature/pull_down_documentation_comments

Custom build task for copying documentation comments added
Add comments to concrete types

We now have a build task that copies comments from interface to
implementation.
Merge pull request #260 from octokit/haacked/comments

Add comments to concrete types