fix selectig download binaries for remote jruby-head, update travis-ci/travis-rubies#1
handle jruby-head as a special case when downloading binary, fix travis-ci/travis-rubies#1
simplify gem installation
fix detecting jruby native directories
make sure gemset/bin is created on gemset initialization
do not show deprecation warning for head ruby, fix #2273
1.23.4
Merge branch 'master' into hotfix/1.23.4
Merge branch 'hotfix/1.23.4' into stable
Merge branch 'hotfix/1.23.4'
add rubygems-2.1.8 md5
change regexp-check to match-anything in __rvm_add_once
make sure to create gemset/bin, fix #2277
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
clean whitespace formating
1.23.5
Merge branch 'master' into hotfix/1.23.5
Merge branch 'hotfix/1.23.5' into stable