v0.4.0-beta

• Fixed: Panic when PostGIS tries to query a layer that does not exist (#78)
• Fixed: Viewer not indicating colors correctly for polygons (#146)
• Fixed: stacked scrollbars showing in the embedded viewer (#148)
• Fixed: Invalid tilejson scheme (#149)
• Added: Support for X-Forwarded-Proto (#135, @mojodna)
• Added: Support for user defined layer names (#94)
• Updated: MVTProvider interface to return LayerInfo (#131)