Fix #85 - Work around OSX bug in ST2 & ST3 related to .tmLanguage location

At least on OS X, ST will ignore .tmLanguage files located in
directories other than the packages' root. Move said file back
to the root to work around this problem.
Merge pull request #86 from guillermooo/fix-tmlanguage

Fix #85 - Work around OSX bug in ST2