Symbols: initial support; 'square'
Symbols: documentation
Symbols: don't add stroke-width to symbol size
Symbols: fill only area within stroke (looks nicer with opacity)
Symbols: other symbols like triangle, hexagon, circle, ...
Merge branch 'master' into symbol

Conflicts:
	doc/mapnik-2.0.md
	doc/mapnik-2.2.md
	doc/mapnik-3.0.md
	pgmapcss/mapnik/mapnik-2.0.mapcss
	pgmapcss/mapnik/mapnik-2.0.mapnik
	pgmapcss/mapnik/mapnik-2.2.mapcss
	pgmapcss/mapnik/mapnik-2.2.mapnik
	pgmapcss/mapnik/mapnik-3.0.mapcss
Symbol: add symbol-rotation
Symbols: update CHANGELOG
Merge pull request #34 from plepe/symbol

Symbols