Update README.md

adding HipChat link
Merge pull request #42 from ncloudioj/develop

Make partition_filter work with iterable
Fix wait() for Future to be compatible to cat()
Remove useless variables
Use the fast channel for the all-agg-columns case
Refactor default functions of aggregation
Move the Python mget() down to Cython
Clean up unused functions
Adding partition_filter
Make partition_filter work with iterable
Fix wait() for Future to be compatible to cat()
Merge remote-tracking branch 'origin/develop' into develop
Bump version to 0.2.3
Add more docs
Updating notice to Tim Day's full MIT notice

Per http://timday.bitbucket.org/lru.html#x1-30002 the actual notice should be:
```
Copyright (c) 2010-2011, Tim Day <timday@timday.com> 
 
Permission to use, copy, modify, and/or distribute this software for any 
purpose with or without fee is hereby granted, provided that the above 
copyright notice and this permission notice appear in all copies. 
 
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
```
Merge pull request #43 from pombredanne/patch-1

Updating notice to Tim Day's full MIT notice
Raise Disco.DataError to let Disco reschedule the failed task
Move import statements into function
Fix issue #44, BooleanIX keeps an invalid txn
Bump version to 0.2.4