Styling changes
Changing default view after logging in from postlogin to playback
Clean up of no longer used images
Postlogin no longer used
Removed old menu code for now. Menu may be added at a later date
Bug fix. Liveview/playback mode buttons. Liveview by default.

* Fixed a bug where the range start / end fields where showing the last
24 hours but the timeline data shows all events on the current date.
* Live view mode is now active by default on page load
* Play / pause tweaked
* Timeline data is preloaded, but not drawn on the timeline on page load
* Live view / playback mode buttons introduced
* Button validation so you can't click certain buttons at certain times
Default view after login is now playback
Overhaul of logout file. Now logs out silently.
Stub functions added for use in a future commit
Classes added for styling