Add UTC offset information to the timezone

In the User Settings, indicate besides the timezone name what the
actual timezone/UTC offset is.

Fixes bug 1103003

Change-Id: I8070df2bc0380da1555c40dc9394895fbfde6848
Split the logo.png into two files to enable splash page branding

This copies logo.png into logo-splash.png and updates the stylesheet
so that the splash screen references the latter.  This facilitates
changing the branding on the splash page only.

Fixes Bug 1102769

Change-Id: Ifd6d213794489dd2664a7124a2d663e390d82331
Merge "Split the logo.png into two files to enable splash page branding"
Merge "Add UTC offset information to the timezone"