Add grunt for client

[atd-schubert]

Use grunt with the following tasks for the client part:

• bower: Fetch resources with bower and layout by type.
• manifest: Create manifestfile dynamically, one for dist and one for debug version
• jade: create the html files generated with jade and add on debug livereload
• clean: remove vendor files and files from distribution to restore a clean version
• requirejs: Make a grunt task for distributing javascript files
• connect: create simple server to try out the client version without a server