Switch to a plain background. Remove unused images
Fix bootstrap font path

CSS was pointing to bower_components/ directory
Move the 'Choose date' button next to the heading
Remove all qTips from the sidebar

Browsers already show the title attribute when placing the cursor on top of
them, so they are not needed.
Use Bootstrap tabs instead of jQuery UI tabs

No more .tabs() calls, let's do it just with markup
Refactor the show_dialog() JS function

Accepts now an object with all parameters instead of a list of parameters.

Improves readability
Hide the shared calendars block by default

The block was being shown for some seconds before the list of calendars was
retrieved, even if calendar sharing was disabled.

Now the block starts being hidden.
Redo the calendar list show/hide styling