update blurb about #20 (CSS visited state on links not being reset after "New Identity")
since we disabled 64bit builds for now (to fix compat w/iOS 5.1), only compile 32bit dependencies
UseNTorHandshake 1
wipe data when force-quitting app (when configuring bridges)
fix #32. much smarter viewport size detection.

(previously failed due to bad sizes for ipad.)
loud warning related to #28.

I can't get the issue to reproduce, but it is probably best to force a tor check on app initialization. also adds way to force-quit app from within the app code.