[casbah] Casbah 2.8.0-RC1 released

The 2.8.0-RC1 Casbah (Scala) Driver has been released. 

This is a release candidate and as such is not recommended for production use.  

This is the second release candidate adds support for the latest MongoDB 2.8 release candidate. Please review the change log athttps://github.com/mongodb/casbah/blob/2.8.0-RC1/src/sphinx/changelog.rst#changes-in-version-280-rc1

As always, please let us know if you have any problems by opening an issue at https://jira.mongodb.org/browse/CASBAH or posting any issues / questions here.