+ commenting out grid rendering - not sure how to display 'long long' values.
+ take into account alpha when rendering building frame
  (TODO: consider more options - roof fill,??)
+ sync set_color(...) methods
+ fix alpha/opacity calc when processing building_symbolizer
Add building symbolizer alpha handling fixes to changelog
+ convert colours to doubles in set_color
remove unnessary semicolon
comment unused function in miniz sources to avoid compiler warning
return the correct type in attribute.get_type
avoid implicit conversions between int types in mapnik::color (fixes clang++ warnings)
Avoid clang++ implicit conversion warnings (-Wconversion)
avoid variable shadowing between members and constructor args
remove unneeded semicolon
fixup docstrings
use size_type correctly
remove unneeded use of const keyword
Avoid variable shadowing
fixup various docstrings
Merge branch 'master' of github.com:mapnik/mapnik
remove unneeded semicolon
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