make sure that rvm do rvm works properly
Merge pull request #1924 from wayneeseguin/feature/implement_1924

Running an rvm process from within another process
fix which on zsh/osx, closes #1940
Merge branch 'master' of github.com:wayneeseguin/rvm
warn users when they try to use bundler out of rvm ruby, fix #1946
mark RELEASE as manual if nothing else was set
fix permissions for zsh completion, fix #1944