Seperate text properties for label placement and text layout.
Merge branch 'jmh-text-prop' into jmh-text-properties
Merge branch 'jmh-text-properties' into jhoffsets

Conflicts:
	src/text/placement_finder.cpp
Fix placement attribute parsing.
Merge branch 'jmh-text-properties' into jhoffsets
Merge branch 'jhoffsets' of github.com:MapQuest/mapnik into jhoffsets
Work on placing sub-layouts