change regexp-check to match-anything in __rvm_add_once
Merge pull request #2276 from wayneeseguin/bugfix/avoid_regexp_match_gh_issue_2276

`(eval):1: failed to compile regex: empty (sub)expression` when running `rvm reinstall ruby-head`
handle whitespace variations in json
Merge pull request #2278 from joshua-rutherford/master

handle whitespace variations in json