This build is for alpha testers only. It fixes a problem where GPS locking didn't work well in the 1.1.1 release. Thank you for the reports on that problem.
Important note: Beginning with the 1.1.1 release, the GPS is put in 'sleep mode' most of the time. In this mode the GPS doesn't even blink the RED LED on the TBEAM. Therefore you can't assume "if I don't see that red led blinking I don't have a GPS lock" - you'll need to look at the screen. In normal operation you'll only see that red led on during brief windows (every couple of minutes by default) where we power up the GPS, get a position and then put it back to sleep.