Added async methods for EndPoint APIs.

[Casualrobin]

[Test] DeleteBranchAsync_ExistingBranch_BrancCouldNotBeListedAnymore() Is failing. I can't see why with my local debug. Open to suggestions.

[mnivet]

[Test] DeleteBranchAsync_ExistingBranch_BrancCouldNotBeListedAnymore() Is failing. I can't see why with my local debug. Open to suggestions.

It's because the test DeleteBranch_ExistingBranch_BrancCouldNotBeListedAnymore had already delete the branch. If you run each test in separate runs it will works, but if you run both in a single tests run it will fail since we don't re-create the test repository with all the branches between each tests. The code setup a test repository with various things in it, then all the tests do things on that test repository.

Possible solutions :

• In a test tear down, re-create the branch to delete if it is not here anymore
• Or in the setup of the test repository create a second branch named branchToDeleteAsync to avoid that the two tests try to delete the same branch

With current test code structure it seems easier to go with the second option. Just complete the code here : https://github.com/MitjaBezensek/SharpBucket/blob/master/SharpBucketTests/GitHelpers/TestRepositoryBuilder.cs#L83