Merge pull request libgit2#496 from libgit2/regret

Bump libgit2

Merge pull request libgit2#489 from libgit2/dont-email

Don't email about build status.

Merge pull request libgit2#470 from libgit2/local-commits

Better unique commit enumeration

Merge pull request libgit2#469 from libgit2/update-modulemap

Update modulemap

Merge pull request libgit2#460 from sagmor/api_consistency

API consistency sugestions

Merge pull request libgit2#463 from libgit2/look-up-ref

Look up ref

++libgit2

Merge pull request libgit2#450 from libgit2/oid-ahead-behind

Support OIDs for ahead/behind count and enumeration

Merge pull request libgit2#446 from libgit2/bump-libgit2-to-fix-statu…

…s-item-crash

Bump libgit2.

Merge pull request libgit2#445 from libgit2/safer-signature

Safe signature