 Merge branch 'efficient-clone' into 'master'
 Merge branch 'efficient-clone' into 'master'

Efficient Clone

Since https://github.com/gitlabhq/grack/pull/1 this warning is no longer needed I think.

8thcolor/rubyconfau2015-sadr,8thcolor/rubyconfau2015-sadr,8thcolor/eurucamp2014-htdsadr,8thcolor/eurucamp2014-htdsadr,8thcolor/eurucamp2014-htdsadr,8thcolor/rubyconfau2015-sadr