Sanitize the $HOME directory references

I know this is supposed to be YOUR settings, r00k, but if you refer to the $HOME folder as such, other people can use this without having to go in and edit the files to match up manually. I also recommended the '$HOME/.rvm/rubies/defaults/bin' for much the same reason, and '/usr/texbin' folders to be used, for those of us that use LaTeX on the command line in addition to in &lt;insert TextMate-like editor here&gt;. Diff as you see fit.
Signed-off-by: Jonathan Sifuentes <jayands2k11@ymail.com>