Fix regression in faceted search introduced by #64
Update to Play 2.3.4, Scala 2.11.2, and SBT 0.13.6
Fix issue in Travis config for running tests
Remove Scala source files from repo

Since this is a Play-Java application, we should not have Scala
source files in the project, as they require additional tools etc.

The custom Assets.scala was a leftover from running as a module,
the TagHelper.scala functions are now inside the template files.
Enable save actions and configure project settings

Set up custom compiler settings, set up and apply formatting rules
Fix compiler and Javadoc warnings
Fix issue with faceting after advanced search with empty q param
Tweak visual appearance

- Use color NRW logo
- Map highlighting using NRW colors
- Specify color for visited links

See https://wiki1.hbz-nrw.de/display/SEM/NWBib-Treffen+10.9.2014
Update to customized Bootstrap 3.2, some visual tweaks (see #65)

Bootstrap customization:

http://gist.github.com/anonymous/3956289918adbc585236
http://getbootstrap.com/customize/?id=3956289918adbc585236