[BUGFIX] rewrite grunt tasks
[BUGFIX] rewrite grunt tasks

closes #138

webit-de/generator-kickstart,markusfalk/generator-kickstart,markusfalk/generator-kickstart,markusfalk/generator-kickstart,webit-de/generator-kickstart,OpenSourceWorkflow/generator-kickstart,OpenSourceWorkflow/generator-kickstart,OpenSourceWorkflow/generator-kickstart