Enable "Upload only on Wi-Fi" by default
Urgent fix.

Prevents a ```NullPointerException``` happening once in a while.
Merge pull request #436 from cpeterso/cpeterso/default-to-wifi-upload

Enable "Upload only on Wi-Fi" by default (@cpeterso)
Merge pull request #435 from tamcap/bugfix

Temporary workaround for GPS exception (@tamcap)
Block CSAD Plzen and Ceske drahy SSIDs
Merge pull request #437 from cpeterso/cpeterso/block-more-ssids

Block CSAD Plzen and Ceske drahy SSIDs