pyDAL 15.03

2015 March release

• Fixed redefine with lazy tables
• Added tests for update_or_insert, bulk_insert,
  validate_and_update_or_insert
• Enhanced connections open/close flow
• Enhanced logging flow
• Refactored google adapters: ndb is now used by default
• Added default representation for reference fields
• Fixed some caching issues when using pickle
• Several improvements and fixes in MongoDBAdapter