Pycassa

* Fixed supercolumn slice bug in get()
* pycassaShell now runs scripts with execfile to allow for multiline statements
* 2.4 compatability fixes

* Failover handles a greater set of potential failures
* pycassaShell now loads/reloads pycassa.columnfamily.ColumnFamily instances when the underlying column family is created or updated
* Added an option to pycassaShell to run a script after startup
* Added pycassa.system_manager.SystemManager.list_keyspaces()

* Allow pycassaShell to be run without specifying a keyspace
* Added pycassa.system_manager.SystemManager.describe_schema_versions()

* Created the SystemManager class to allow for keyspace, column family, and
index creation, modification, and deletion. These operations are no longer
provided by a Connection class.
* Updated pycassaShell to use the SystemManager class
* Improved retry behavior, including exponential backoff and proper resetting
of the retry attempt counter
* Condensed connection pooling classes into only pycassa.pool.ConnectionPool
to provide a simpler API
* Changed pycassa.connection.connect() to return a connection pool
* Use more performant Thrift API methods for insert() and get() where possible
* Bundled OrderedDict and set it as the default dictionary class for column families
* Provide better TypeError feedback when columns are the wrong type
* Use Thrift API 19.4.0

Deprecated in Version 1.0.0

* ColumnFamilyMap.get_count() has been deprecated. Use
ColumnFamily.get_count() instead.

* Allow for more backward and forward compatibility
* Mark a server as being down more quickly in Connection

* Added PooledColumnFamily, which makes it easy to use connection pooling
automatically with a ColumnFamily.