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
save the original requestor's IP so it doesn't get overwritten

bug 1046837

Change-Id: I803fe9759b073fa1bc3d65240962a51f610db9d1
Merge "Split the logo.png into two files to enable splash page branding"
Merge "Add UTC offset information to the timezone"
Merge "save the original requestor's IP so it doesn't get overwritten"