Added function to quickly fix pip

pip seems to throw errors randomly when listing packages or when trying to
install new ones. The two commands in this function will fix them, reinstalling
pip and reinstalling the distribute package.
Created PYTHONSTARTUP script

It's a little bare, but I created the environment variable, and
customized the prompts to match what I use in irb.
Formatting
Added tree view function (ltree)
Color grep by default
color grep not default

Opted for the sake of piping and redirection to keep grep and just make
a "cgrep". It'd be more trouble than it's worth to have to remember to
\grep in a long pipe chain if I want to append or write as a file.
dict -> dict -d wn by default