Added blank .vimrc.

Note that .vimrc is inside the .vim directory. This is because I want to keep
everything in one file for easier version control. To use this configuration
you still need to put a .vimrc or _vimrc (Windows) file in your home directory
with a 'source ~/.vim/.vimrc' or 'source ~/vimfiles/.vimrc' (Windows) line in
it.
Added pathogen for easy plugin management.
Added some basic settings.

Changed execute to call for pathogen because execute didn't work with syntax
highlighting. Set nocompatible, filetype plugin indent on, syntax
highlighting, autochdir, textwidth, and mapleader.
Added colorscheme molokai and set as default.
Removed menu, toolbar, and left and right scrollbars.
Back up files to .vimbak.