PageState.js: allows to use window.history.state, which is dubbed `data`. PopState Handlers are now called with the PageState object as first and only argument, in order to allow access to `data`.
QfqPage.js: use data to store page title in page state. Constructor sets page state explicitly, if none exists so far by setting it to the active tab; this allows to navigate to the first state.

Gruntfile.js: concat and uglify for our javascript stuff.
Added support for storing state of Bootstrap pills.
Added jasmine tests.