Fixes rvm_prompt_info() in lib/rvm.zsh
Returns false when rvm is not found.
Returns false when rbenv is not found.
Adds chruby_prompt_info dummy function.
Joins ruby prompt files and adds ruby_prompt_info.
Refactors ruby_prompts.zsh
Adds all other dummy implementations.
Adds documentation.
Renames the file to prompt_info_functions.zsh
Fixes RPROMPT in af-magic.zsh-theme
No need to eval in rvm_prompt_info!

Just activate word-splitting.
Merge conflicts with af-magic theme