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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.

According to @graywh's comment on:
https://github.com/sstephenson/rbenv/issues/185

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 

Detects the platform using "uname", and sets the alias accordingly.
If you are using Linux, this assumes that you have created a
symbolic link to /usr/bin/sublime_text.

^/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