Add description, change name to Ruby Reek

To follow convention of leading bundle names with their parent language.
Run command with ruby 1.8
Add requiredCommands for Smell command

This will automatically set `TM_REEK` when reek is located in one of the listed locations.
Save current file before running command

Since the command is run on the saved file this makes sense, also fixes an error that happens when run on an unsaved file.