- psycopg2cffi.compat.register doesnt muck with psycopg2.extras and psycopg2.extensions causing an issue. Change to apply the registration directly.
- Move PYPY flag to utils
- Update tests accordingly

- Keep track of the number of query executions and exceptions per connection
- Add report function to both Pool and PoolManager
- Add methods for returning a list of busy, closed, executing,  and locked connections in a Pool
- Rename Pool._connection to Pool.connection_handle

Implement Results.__bool__ method.

Python 3 dropped __nonzero__ in preference to __bool__.  The code was
only working because they fall back to __len__ if __bool__ is not
implemented.  This commit adds a __bool__ implementation that simply
calls __nonzero__.