Merge pull request #149 from SpiderOak/settings-screen

Implements a good chunk of #70 (settings screen)
Merge pull request #148 from SpiderOak/issue-130

Fixes 130

Fundamentals work.  The app needs to present some essential offline-mode awareness - will submit an issue describing what I'm thinking.
Updated Icons
Merge branch 'master' of https://github.com/SpiderOak/SpiderOakMobileClient into beta1