Import GTTreeBuilder.h into ObjectiveGit.h
Copy static library headers to previous location
Import GTTreeEntry.h into ObjectiveGit.h
Merge pull request #167 from randomsequence/missingheader

Import GTTreeBuilder.h into ObjectiveGit.h
++libgit2
Minor fixes for breaking libgit2 changes
Modernize GTEnumerator and its call points
Ignore unzipped fixture repositories
Move all "contants" into GHTestCase

Leaving them as functions for now, but they should eventually become
methods on the test case class.
Converted existing GTEnumerator tests to Specta/Expecta
Added globbing support to GTEnumerator
Don't add nil objects to an array, yo
Remove now-unused GTRepository+Private extensions
First pass at GTSubmodule
Clarify how each enum is combined (or not)
Add `repo-with-submodule` fixture
Add a GTRepository method to enumerate submodules
Fix up fixtures
spaces -> tabs
Replace -reset with -resetWithOptions:, remove -setOptions: