Limit ObservationPointsOverlay drawing to 150 ms

Too many points, and the drawing can cause lag on slower devices.  This
will limit the impact.

Performance testing should be done to determine appropriate values for
the maximum duration, as well as how often to check the time.
Fix #766 - Don't check for app updates if Wi-Fi is disconnected and "Upload only on WiFi" setting is true
Alphabetize MainActivity.java imports
Clean up MainActivity.java whitespace
added SimpleKML and SimpleXML dependency
fixed build for simplekml dependency
reverted an accidentally deleted lint directive for translations
Merge pull request #837 from keverets/limit-history-drawing

Limit ObservationPointsOverlay drawing to 150 ms
Merge pull request #840 from cpeterso/cpeterso-issue-766-update-over-wifi

Don't check for app updates if Wi-Fi is disconnected and "Upload only on WiFi" setting is true
Translate new string to spanish
Add a preference to keep the screen on while in the map
Merge pull request #847 from stripTM/patch-4

Translate new string to spanish
Merge pull request #845 from crankycoder/features/844-simplekml

added SimpleKML and SimpleXML dependency
Merge branch 'dev' of github.com:mozilla/MozStumbler into features/629-unittest

Conflicts:
	app/src/main/java/org/mozilla/mozstumbler/client/MainActivity.java
	build.gradle
	proguard.cfg
import cleanups