Feature and Bugfix release

This release contains both feature enhancements and bugfixes:

• performance increase insert vs upsert
• update handling of non-mongoid ID-fields (bugfix)
• updated Tests
• new strategy for buffered writer: WAIT
• setting maxwait / timeout for waitstrategy in bufferedwriter
• moving id creation to morphium, implementing proper inserts, fixing bugs
• fixing buffered writing on sharded environments
• performance increase
• mongodb driver version update, checkfornew default fix