fix escaping of 'command ps' in installer for rvm.sh, fix #2962
do not use rbx --skip-system on arch, update #2942
require system llvm for rubinius, closes #2942
Corrects typo in error message displayed to user

Replaces "for a example" with the correct "for an example".
Merge pull request #2972 from gilles-leblanc/fix-typo

Corrects typo in error message displayed to the user
remove superfluous characters that cause error if entered verbatim
Merge pull request #2979 from chris-tsongas/ruby-version

remove superfluous characters that cause error if entered verbatim
Make sure Darwin uses i386 as the arch
fix rvm user ..., fix #2963
Merge branch 'master' of github.com:wayneeseguin/rvm
Updates the MagLev download URL to gemtalksystems
Merge pull request #2985 from johnnyt/jt-maglev

Fix install of MagLev on Macs, fix #2984