catch exceptions from swapCache()
added time display

* shows current time in both UTC and local based on timezone
* fades in with a fancy animation when the app starts
* ticks in real-time
reworked page switching logic
Merge branch 'master' into feature-time

Conflicts:
	index.html
fixed error when concatinating js files
fixed date format

* getDay() gives day of the week, replaced with getDate()
* getMonth() returns in the range of 0-11, not 1-12
remove unneeded CSS class

* introduced in c5afdc1ba6661520ade244d22b6f51164b9e0ef2
reworded logic for settings switches
Merge branch 'master' into feature-time
added switch to hide timebox
fix hang in loading page after force update check

initTracker() exited prematurely when called after force check for update.
This happens only when there is no update available.
Vehicles in list show time since last pos

* The 'received' field now indicates how fresh position is
* Human friendly delta time between now and when the position
  was originally received
hovering the graph will display the past time
Merge branch 'feature-time'