add documentation for streaming blob objects
Merge branch 'streaming_blob_documentation' of https://github.com/cubehero/rugged into development
Readme: Reword paragraph on streaming blobs.
bump libgit2 to 58eea5
Rework and extend the unicode branch/ref name tests. Fixes #361.
Merge pull request #372 from libgit2/arthur/fix-unicode-tests

Rework and extend the unicode branch/ref name tests.
CI: Build Rugged on OS X.
Bump the ruby 2.1.x version.
Allow the OS X build with Ruby 2.1.2 to fail.