(cherry picked from commit 29dd7fd472)

Allows more flexibility downstream

Also some minor documentation and naming changes for consistency.

problem was new lines, not time.

Is there a way to force it to return in smaller chunks?

Also fixed the "isNetworkConnected" for ESP8266

Also shorted time between checks in "isNetworkConnected" for all modems

- fixed int/uint warning
- added functions to get local IP address with esp8266
- fixed local ip fxn for xbee
- removed extra test builds
- set travis to build all modems in tests

I realized they're not as usable on their own as I expected.