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Evaluates $(rbfu --init --auto) if rbfu is installed on the system,
also has a custom rbfu-rubies method which lists the installed
rubies which are available to rbfu.

For compatibility with themes, also creates the rvm_prompt_info
function, so existing themes should work out of the box.

Make the $apt_pref variable evaluatet at alias expansion by using single-quotes instad of double quotes

The heroku command should not be executed via bundler, see:
https://github.com/heroku/heroku/issues/173 

^/branches/featurename
^/releases/Release-vx.y
^/trunk

- avoid rr as it is mostly used for restart rails server

add powit command to symlink an app if it hasn't been already

https://gist.github.com/1019777/70dbb46db9bd5b346faf543a9dd4edac4782adda

this fix allows _within-bundled-project() to properly pickup a Gemfile
within a root level folder (ie. /my_project)

Removed the assignments to fpath as well, since that's all handled in the .oh-my-zsh/oh-my-zsh.sh boot script.