v0.3.6

• Add blue arrows on designated roads. See #304.
• Fix missing wind turbines. See #267.
• Fix incorrect overloading of amenities tags, leading to some amenities not
  being shown. See windmills in #267 for instance.
• Render guidepost and map for cyclists. See #341.
• Render unknown surface. See #345.
• Rework blue / cyan / green colors. See #324.
• Fix a bug with dashed road surface being drawn on top of side cycle track.
  See #136.
• Only render bicycle:conditional tag on highways. See #371.
• Make sure cycle network nodes are drawn in many situations (overlaps).
  See #287.
• Whole rework of roads layers processing. Generation of Mapnik XML is now
  much faster and resulting XML file is much smaller. See #364.
• Only render bike stations and low priority POIs names from Z18 and above.
  See #359.
• Only render cycle lanes / busways from Z12. See #354.
• Do not render underground buildings.
• Fix a render issue with labels and amenities. See #362.