The old vim-powerline project is deprecated and is no longer officially supported. It has been replaced by a new, Python based port. It is strongly recommended that you migrate to the new project as soon as possible.
Note that this branch no longer contains any compatibility code. The new plugin has built-in support for Vundle, see the docs for details.
The old project will still be available in its current state in this repo (checkout the develop branch to continue using it).