Fixed git2.h not including threads.h anymore
Fix GCD typo
Merge pull request #2708 from phatblat/pr/threading-doc

Fix typo in THREADING.md
Merge pull request #2707 from swisspol/fix_include

Fixed git2.h not including threads.h anymore
Add test script
Added Xcode script
Fixed active_refspecs field not initialized on new git_remote objects
Added git_stash_apply() and git_stash_pop() APIs