Initial add of blame methods
Blame methods
Fix byline shouldAlloc and some formatting adjustments
Enable remaining blame methods
Introduced an altType to shadow different cTypes

Branch is just a Reference, but we infer based off of the cType, so
I've added a way to provide an override.  Might not be the most elegant,
so I'm willing to change this behavior.
Merge pull request #243 from nodegit/branch-methods

Branch methods