Changed send-prefix bind in tmux

Changed send-prefix bind in tmux to C-a a so it will not conflict with
the last-pane bind.
Added local config file for tmux
Updated README
Updated gitconfig file to make pushing easier

Changed gitconfig to make push default to upstream if remote is not
specified.
Added persistent two line status bar to vim
Rewrote install script as a python script

Wrote a more robust version of the install script in python instead of
BASH. The script does not do more than the old program, but it is more
robust in terms of safety and error reporting.
Added example local tmux config
Refactored install script
Added 'count' alias to git to count lines of code
Updated vimrc

Made it easier to edit multiple buffers by allowing auto-hiding of
edited buffers (instead of having to save buffers before hiding them).
Made vim remember more history.
Updated README with new name of install script
Updated tmux config for better vim-like copy mode
Updated git aliases

Changed diff aliases to output in color (using the '--color-words'
switch), added aliases for nicely formatted graph log output.
Fixed mixed tabs/spaces in some files
Made 'womprat' the default vim color scheme
Updated vimrc with instructions for 256 color mode
Changed tmux $TERM setting

Changing the default $TERM setting in tmux from 'screen-256color' to
'xterm-256color' fixed color support detection for some programs.
Added grb256 vim color scheme
Fixed path to global gitignore file in gitconfig
Added over length column highlighting to vim