Fixing the MacVim PATH inclusion

This should only happen on Mac systems
Removing obsolute PS1 directives

These weren't doing anything on the OSX or Linux side of things
Comment cleanup for readability
Smaller history size to pos. speed up performance
Better path setup for custom install locations

This symlinks the install directory so that the bashrc knows where to
find some useful includes.
Removing unused completion links

There are no files here on any of my systems, so I'm removing these
calls. The completion script comes along with the bash system
New method for including relative files

The install script creates a sym link so the bashrc now just can include
off a home dir defined path
Merge branch 'master' of github.com:bryankennedy/best-bash

Conflicts:
	bashrc.sh