Propose unified rev-parse API
Implement unified git_revparse
Deprecate git_revparse_single and _rangelike
Add rev-list example to makefiles
Reintroduce git_revparse_single.
Redeploy git_revparse_single.
Change git_revparse to output git_object pointers

This will probably prevent many lookup/free
operations in calling code.
Clean up example code.
Clean up minor details
Merge remote-tracking branch 'ben/unified-revparse' into development
Is this crazy?
git_revision -> git_revspec
Update docs
Fix examples
Merge pull request #1469 from libgit2/vmg/unified-revision

Unified rev-parse, with a revision object