worked on css and js asset reving, and angular partial precaching, still need to fix panel module.html, issue #418

influxdb:difference feature

Add support for the difference query from InfluxDB

Merge branch 'hkraemer-filtersrv-object-refactoring' of github.com:Tetha/grafana into Tetha-hkraemer-filtersrv-object-refactoring

Add seconds as a new axis formatter

 - filterSrv expects the parameter to init to be the actual
   dashboard object (I'll depend on that later on), so
   I had to pass dashboard.current in there, instead of
   dashboard
 - in the last test, the problem was exactly that again.

 - init with dashboard mock

 - had to call init with dashboard mock

 - had to call init with the dashboard mock, since this checks
   dashboard.refresh (need to look at that sometime)

- small misunderstanding on my part, fixed the API in the filterSrv back
- renames to match my renames
- init script has to be called or fundefined things happen

Mostly renames, new init semantic and I forgot to call
updateTemplateParams in addTemplateParameter

After all, we are using the function "template" to apply some
data we pull from the URL or other situations in order to call
a function called template. Hence, filtering doesn't make sense
as a term here.