v0.3.4

Added

• Support for authorization token and server for WebMap request (by @manders)
• Support for layer order with custom pane
• Support for FeatureCollection without featureCollection property
• Support for layer opacity (partial)

Fixed

• FeatureLayer does not appear after initializing (#57)

Changed

• Separate modules for calculating a label position
• Use arcgis-to-geojson-utils as converter
• Separate a module for label icon as LabelIcon