Display overtime as a colored diff on the booking page

We display the overtime as the difference between booked hours and
expected worked hours. The value is colored accordingly in red if the
user hasn't worked enough or blue is he has overtime.
Better wording for the overtime summary block on the front page
Disply current month name instead of "this month"
Request summary block infos only if dom is still there
Merge pull request #374 from dsp/summaryBlockAdjustments

Summary block adjustments
Use pointer cursor for fake buttons
Merge pull request #375 from exi/filter-layout

relocate filter and export button
Merge pull request #376 from exi/PTC-158-project-statistics

create stub for team statistics
remove start/livebooking menu stubs

they have not been used ever
make the location hash work

refactor the menu/viewmanager interaction to make it work nicer
Merge pull request #377 from exi/hashtag-support

Hashtag support
make the default json view compress output
add action to return projects managed by current user
add timecard model function to return bookings for managed projects
convert timecard controller to use context switching
add timecard action to get member bookings for projects
modify projectChooser to support custom data sources
add frontend model functions for the managed projects and project bookings
add team statistics to the frontend
fix small style issue in the monthtable