Send HTTP request failures to the Xposed log
Added AT&T and Cricket APN presets

Thanks to Mike B. @ XDA.
Update build tools, gradle
Update to support Hangouts 2.5.81636427

I've done some limited testing and everything seems to be working.
Again, I've tested every feature but not more than a few times.
Avoid filling the log with raw image bytes
Add (probably unnecessary) cache file check
APN splicing is now "experimental-ish."

Also added a notice to set the APN configuration.
Push versionCode/Name to 8 and 1.6 respectively