disable all the radio buttons before workers accept this HIT
Allow crowd to check attr dedup
Basic join support for RawSC, will not work with normalizedsc since hive only has 2-way join support
Merge pull request #6 from sjyk/join_rawsc

Basic join support for RawSC
add documentation for deduplication
Merge pull request #7 from sjyk/changes_Juan

add documentation for deduplication
Renamed amt_server to crowd_server.
Added a base app with generic models/views for interacting with a crowd.
Refactored AMT models to use the base model.
Fixes to views and storage so that AMT now runs on the basecrowd abstraction.
Updating celery tasks for basecrowd model.
Added better start/stop scripts for the crowd server.
Bugfix in new celery task.
Cleaner class for registering crowds and auto-appending related fields.
Added a basic interface for new crowds.
Storage functions make saving optional.
Updated create_hits view to use generic interface.
Made crowd urls more generic, moved generic view code to basecrowd.
Made stop script only kill python processes started in crowd_server.
Integrated model and interface registration, Implemented the generic view to delete tasks.