Merge branch 'master' of github.com:mapnik/mapnik
make markdown files
add sample Makefile for local dev
recompile stale targets during deploy
properly populate the context
update readmes for template plugins
move svg marker  modifiers to hpp file for re-use in other renderers
remove references to now unused mapnik::arrow
remove reference to arrow.cpp
start carrying through the geometry clipping extent in the grid renderer
agg markers_symbolizer rendering: only create objects if actually rendering
sync grid markers_symbolizer rendering with agg
remove duplicate variable
support setting fill and stroke opacity on the fly in svg marker rendering
implement built in support for ellipse and arrow markers, make markers_symbolizer default to POINT placement and ellipse drawing, add back compatibility for deprecated marker-type property - refs #1285 and #1304
Merge branch 'master', remote-tracking branch 'origin'
Merge pull request #1311 from mapnik/stock-markers

Stock markers support 
Merge remote-tracking branch 'origin/master'
+ enforce const
+ pass arguments by const ref
+ more const correctness