tzhe gem should not be in the gem by itself
Merge remote-tracking branch 'upstream/master'
refactor the configuration for tinymce

there have been two problems:

* because the code in sprocket_helper is written in JavaScript
and then pasted into a CoffeeScript file, it was not corecctly
parsed

* if an option in tonymce.yml has a boolean value, it was not
injected as a boolen value in JavaScript but as a String what
validated to true.
Merge pull request #40 from sumcumo/refactor_tinymce_configuration

Refactor tinymce configuration