Merge branch 'hotfix/1.18.5' into stable
Change 'lib' to 'mrblib' in mruby installation

In mruby the 'lib' directory is called 'mrblib'. Right now `rvm install mruby` errors out on the trying to cp the lib directory: `.rvm/src/mruby-head/lib: No such file or directory`.
This commit changes 'lib' to 'mrblib' to address this issue.
Merge pull request #1502 from rjsamson/master

Fix mruby install - change mruby 'lib' directory to 'mrblib'
try adding topaz
use binary package ONLY
forgot install script
Add ruby-1.9.3-p385
Merge pull request #1506 from hokkai7go/193p385

Add ruby-1.9.3-p385
build script for topaz
installs either binaries or compiles
Merge remote-tracking branch 'timfel/topaz'
Don't clobber PYTHONPATH
Merge pull request #1508 from timfel/topaz

Topaz
Construct ruby version more sanely
make sure no / is allowed in gemset name, fix #1504
cleaning selectors, update #1504
fix PATH cleaning on ZSH, fix #1500
Update ruby-2.0.0 to rc2
Merge pull request #1513 from cwgem/ruby-2.0-update

Update ruby-2.0.0 to rc2
1.18.6