Memsql

* Made it easier to modify data on a task_handler
* Better unicode support

* 2.10.0 made certain queries go through the formatter even without
params, this broke things like having single percents in queries.

* Modified SQLStepQueue to work with MemSQL distributed
* added tests
* added extra_predicate (to pop/inspect different subsets of the queue)
* exposed escaping in database.py
* fixed some 2.6 compatibility issues
* added requeue and bulk_finish to sql_step_queue

* Implemented _mysql 1.2.5 compatability
* All of the query methods now take lists and tuples as
arguments. They will expand into ','.join(escaped_sequence).
* Public interface should be 100% backwards compatable
* All of the query methods now take kwargs. If you specify kwargs, your
query will require %(arg_name)s blocks as opposed to %s blocks. You
can't pass both args and kwargs.

* Fixed a random_aggregator_pool bug

* Fixed a minor 2.6 deprecation warning