Remove GPS info from photos when geotagging is off.
Refactor instance property for stripping for method parameter.
Use system constant for GPS metadata key
Use system constants for TIFF metadata key.
Remove unused class
Add documentation of new stripGeoLocation parameter.
Refactor code to do all changes in metadata on metadataFromRepresentation method.
Remove unnecessary perform blocks.
Merge branch 'issue/408-Remove-Location-Metadata-From-Exif' into develop

Conflicts:
	WordPress/Classes/Services/MediaService.m