Version to 0.9.2 and Changelog (with some backstory)

Bump version to 0.9.1

Merge pull request dpkp#134 from wizzat/conn_refactor

conn.py performance improvements, make examples work, add another example

Fix dpkp#44 Add missing exception class

Also move the exceptions to common instead of util

Add Snappy support

Fixes dpkp#2