add support for custom_flags
fix checking --ignore-dotfiles
fix reading custom_flags
fix saving custom_flags
add scripts/extras/chruby.sh - mrvm - special version for chruby
respect rvm_ignore_dotfiles_flag when displaying notes
Merge pull request #1750 from wayneeseguin/features/chruby

Integration for chruby
use rdoc-data for rvm docs generate, update docs, closes #1856