Make it possible to `require "therubyracer"`.

It's common practice to be able to require the name of the gem. For
example, bundler requires the gem name by default. This removes an
element of surprise when using the gem.
track proper libv8 compatibility
v0.12.0
Added support for context timeouts
protect against possible concurrency bug
use supported rbx modes
Add info on calling js functions to README
Make support info in README more searchable
Update README.md
Add Ruby 2.1.0 to .travis.yml
fix threading specs on rubinius
attempt to make rubinius happy
be kind. compare equality, don't assign
continue trying to fixup rubinius build for travis
use :platforms to differentiate gems in gemfile
workaround rubygems#763 to fix build on ruby 1.8.7
bump rbx build to use v2.2.3
Merge remote-tracking branch 'samsaffron/master'
Update documentation for execution timeout feature
Merge remote-tracking branch 'salimane/pr_ruby_2_1_0'