Updated ActionBarSherlock to version 4.3.1.
Removed User Agent from portal detection request. Fixes 34

Starbucks proxies were returning a false success page to clients with
the old user agent string for some reason. Removing it fixed the
problem.
Added periods to the end of all changenote bullet points.
Fixed unsupported XML lint error

android:windowActionModeOverlay isn't supported before API 11, and
sign-in dialog looks fine (on android 4.1.2) without it.
Prepared for v1.4.0 release