add extra check for updating yum cache
Update Warning Message

Was getting SM not found on OS X after updating to RVM stable. Include the fix in the warning.
Merge pull request #1930 from wayneeseguin/feature/implement_1942

RVM does not know how to install 'libyaml-devel' on Fedora 19
Update Warning Message
Merge pull request #1960 from softwaregravy/patch-1

Update Warning Message
fix order of recomended package managers, update #1960
improve sudoers error handling, fix #1953
extended handling of sha and tag when head ... fix #1961
typo fixes
Merge pull request #1966 from cczona/master

typo fixes
fix mounting binary rubies, fix #1957
Merge branch 'master' of github.com:wayneeseguin/rvm
add binaries for fedora17 and link osx 10.8 to 10.7, fix #1965
initial support for sabayon
Merge pull request #1967 from julp/support_for_sabayon_linux

An initial support for Sabayon Linux
reworked freebsd package manager detection and updating, fix #1952
Merge branch 'master' of github.com:wayneeseguin/rvm
improve detecting pkng in freebsd, update #1952
make fuzzy matching respect installed named rubies, fix #1972
rubinius is also valid interpreter name for rbx, fix #1973