rvm implode default

Use RVM set default ruby and system if it hasn't been set


--version, -vShow version of rvm
--defaultWhen used with ruby selection, sets a default ruby for new shells
--debugEnable debug mode
--forceForce install, removes old install & source before install
--allUsed with 'rvm list' to display 'most' available versions
--summaryUsed with 'do' to print out a summary of the commands run
-CCustom configure options, comma separated, double quote args that need quoting, default