Monty

1. Added timeout function. Useful to limit function calls that take too long.

1. New backwards incompatible MSONable implementation that inspects init args
to create a default dict representation for objects.

1. New jsanitize method to convert objects supporting the MSONable protocol
to json serializable dicts.

1. New frozendict and MongoDict (allows for Javascript like access of nested
dicts) classes (Matteo).
2. New Command class in subprocess which allows commands to be run in separate
thread with timeout (Matteo).

1. More fixes for reverse read of gzipped files ofr Py3k.

1. Fix reverse read file for gzipped files.