Add supertab

This plugin does all insert-mode completion with Tab.
URL: http://www.vim.org/scripts/script.php?script_id=1643
Add vim-better-whitespace

This plugin highlights the tabs and spaces at the end of a line.
It doesn'show mixed spaces and tabs at the begging of a line.
URL: https://github.com/ntpeters/vim-better-whitespace
Add ctrlp

Fuzzy file, buffer, mru, tag, ... finder with regexp support.
URL: http://kien.github.io/ctrlp.vim/
Add .vimrc into vim file

All modifications that are intended for .vimrc should be applied in ~/.vim/vimrc
In order to use it you need to make a symbolic link:
ln -s ~/.vim/vimrc ~/.vimrc