set ackprg to ack-grep for Ubuntu and the other Linux distributions
add vim-fugitive and nerdcommenter; delete tcomment_vim
update README.md
use YouCompleteMe as default
add vim-sneak and remove yankstack
update nerdtree and ctrlp settings
change back to tcomment_vim
use AutoComplPop
update completion and snippet settings and plugins
remove vim-nodejs-complete
update install script
update install script
update vimrc and README.md
Merge branch 'refining'