puppet: fix the first regex in case statements
Rendering correctly Ruby 1.9+ symbols

* Adding a rule to handle new hash syntax with symbol keys
* Adding %i and %I to the shortcuts list (Ruby 2.0+)
* Fixing the class regex to handle class: and def: hash keys
Adding a Github theme
add a background to the github theme
Merge branch 'github-theme'
add 1.9 samples to the visual specs
Merge branch 'ruby-symbols'
v0.3.5
fix ci by restricting to minitest 4