v3.2.0

Changes:

• Replaced database.truncate(excludeSystem=false) with database.truncateAll.
• Replaced database.collections(excludeSystem=false) with database.allCollections.
• Removed the excludeSystem option from database.truncate and database.collections (default is now true).
• Added support for AQL user functions API.
• Added database.createEdgeCollection as convenience method for database.createCollection(type=3).
• Added support for line-delimited JSON in collection.import.
• All functions that accept document handles now also accept document/edge/vertex objects instead.
• Improved documentation.