add jruby-1.7.13
Merge pull request #591 from neojin/jruby-1.7.13

add jruby-1.7.13
Add rbx-2.2.10
Merge pull request #595 from mkroman/master

Add rbx-2.2.10
ruby-build 20140702
Add link to suggested build environment to README
Merge pull request #603 from wjordan/patch-1

Add link to suggested build environment to README