new project: shell-env

A cross-platform mix between RVM and Homebrew
First credible shell-env impl. Still buggy
Ported shell-env to ruby, made it work
shell-env cleanup
Updated shell-env
Fix README.md rvm usage
Added a .gemspec
README.md updates
README formatting
README example
Using absolute /usr/bin/env path
Deal with unknown directory

unload current environment if the current directory doesn't exist anymore
README update
More robust ENV parsing

Marshals modified ENV hash in subprocess
Remove dead parse_env test
cool hack: pre-load shell-env in sh to rename RUBYOPT

That's a nice trick I just learned by trial. Did you know you could
do this ? So awesome...
README: adds licence section
Contribute notice
Fixes 1.8 incompatibility. Props to judofyr!
Set $0 for ruby-1.9.2