Updated: Switched from Lokaltog/powerline back to Lokaltog/vim-powerline.

Lokaltog/powerline was horribly broken here, Lokaltog/vim-powerline does
a quite good job without Python.
Fixed: Requiring runVimTests.
Fixed: Removed tpope/vim-fugitive which I never used.
Added: kien/ctrlp.vim as recommended by @beberlei.
Added: szw/vim-kompleter for non-smartcase autocomplete.

Lets see what else it can gain.