Follow: Fix forgotten implementation of Location class.

During the refactor of FusedLocation both the heading and speed have not been passed from the fusedLocation to the location object.
Merge pull request #1065 from arthurbenemann/followFix

Follow: Fix forgotten implementation of Location class.
Version: Releasing version 2.7.5
Core: Warn about all high severity messages from the Drone
Merge pull request #1066 from arthurbenemann/warnings

Core: Warn about all high severity messages from the Drone
Version: Releasing version 2.7.6
Core: Keep the received firmware version in the drone object
Android: Show firmware version on setting screen
Merge pull request #1067 from DroidPlanner/firmwarVersion

Display firmware version on settings screen
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into fix_issue_1051
fixed marker update issue reported by @keyoss.
removed guava library dependency.
update project's gradle build plugin version.
Merge pull request #1072 from ne0fhyk/update_android_studio_project

Updated project's gradle build plugin version.
fixed the cause of a NPE crash on the flight mode screen.
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into fix_ga_reported_crashes
fixed the cause of a NPE crash on the flight mode screen.
added null reference check to prevent ga reported crash bugs.
added null reference check to prevent ga reported crash bugs.
added null reference check.
added class check before casting.
Merge pull request #1073 from ne0fhyk/fix_ga_reported_crashes

Fix several crashes reported through Google Analytics