infrastructure lift - SASS now integrated in Gruntbuild
screen.css now removed from distribution
moved sass to top of tasks to perform
infrastructure lift - combining js files for frontend (uglify)
added uglify to credits
small cleanup in gitignore
Merge commit 'd9e0d14132ab0daf66383bf0611590bf0501b2d9'

# Via Nicole Rauch
* commit 'd9e0d14132ab0daf66383bf0611590bf0501b2d9':
Merge pull request #451 from leider/master

infrastructure lift