Bump version to 1.1.13.

Bump to 1.1.12.

Fix references to removed Unsafe stuff in JRuby and bump to 1.1.11

Bump version to 1.1.10.

Revert description changes (damn you, RubyGems.org!). Fixes headius#22

Add license to gemspec.

Bump version to 1.1.7.

Bump to 1.1.6 for botched 1.1.5 release.

Fix headius#15 by explicitly testing for GCC's CAS.

Patch by @zimbatm.

More formatting for description.