escape the source command in after_use_maglev hook
use rdoc-data for rvm docs generate, update docs, closes #1856
Merge pull request #1862 from choxi/master

oh-my-zsh alias breaks after_use_maglev hook
escape sourcing helpers in hooks, update #1862
check update-alternatives for java before trying to install n debian like, closes #1816
add extra check for bin/ruby while installing ree, update #1870