Fixed splitting on nil error.
allow forcing implode without asking question, fix #2947
Merge pull request #2933 from danielpclark/master

Fixed splitting on nil error.
add an error when osx-ssl-certs is used on system other then OSX, fix #2940
Merge branch 'master' of github.com:wayneeseguin/rvm
add extra check for installation script to detect tar errors