Version: Releasing version 2.8.6
Survey: Renamed some packages
Survey: Fix imports broken by last commit
Survey: Use the footprint class to do the survey math
Merge pull request #1278 from DroidPlanner/surveyCamera

Survey camera
gradle plugin update.
unused string cleanup.
removed mapbox map implementation.
removed use of android api within a core class.
removed unused attributes, and resource files.
removed unused menu resources.
updated travis configuration file.
Merge pull request #1279 from ne0fhyk/code_cleanup

Code cleanup