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allow setting tilt version via env var
check JS availability for CoffeeScript tests properly
add therubyracer to gemfile (needed to run coffeescript tests if ther…
…e are no alternatives)
Merge branch 'drop-1.8.6'
JRuby 1.6.0 and Rubinius 1.2.3 have been released
drop 1.8.6 support
Use platforms properly in Gemfile, even though bundler is broken.
typo in Gemfile comment
add some test guards for rbx
fix Gemfile for 1.8.6
Add Gemfile, fixes #152.