Add G++ to the system requirements. Fixes #1761.

While G++ is primarily used for RBX (Rubinius) it's
also used by quite a few other gems so it doesn't
hurt to have it on the general requirements list too.
Just so they don't have SSL issues on Debian.
add fry to help/alt.md
Merge branch 'master' of github.com:wayneeseguin/rvm