AWT: respect alpha, make some classes accessible (Develar)
Docs: moved README.md to top level, added screenshots and fixed links
Writer/TagMapping: removed duplicate entry
Writer: clipping MultiPolygons to tile for much smaller geometries/file size
RenderthemeV4: added display directive to force display of elements regardless of space
Samples/ChangingBitmaps: create layer before they are added to view.
RenderthemeV4: fix to display directive, drawing all elements in priority order
Merge branch 'master' into gas