renderTheme-v4.xsd adjustments based on src
Symbol size scaling at Area, Line, LineSymbol
FileSystemTileCache: store tiles as zoom/x/y (thanks to Michael v Glasow)
FileSystemTileCache: recursive delete and no exception when tile cache cannot be written
Samples/TileSizeChanger: bug fixes
FileSystemTileCache: remove unnecessary directory delete
Migration to AndroidSVG library for better support of the SVG
specification
FileSystemCache: putting tile key into error msg
MapWorker: unset debug time logging
Gradle/SVG: remove android-svg from gradle build files
Gradle: move to 0.12 version of gradle android plugin
Layer: javadoc fix
Merge branch 'dev' into persistent-cache

Conflicts:
	mapsforge-map/src/main/java/org/mapsforge/map/layer/cache/FileSystemTileCache.java

Signed-off-by: mvglasow <michael -at- vonglasow.com>