Temporary hack to scale back number of datastore reads
Add administrator panel
Improve decoding assignment speed and memory use

-Improve language model filtering to use less memory
-Change representation of per-sentence scores for fewer datastore ops
-Decrease frequency of polling (also results in fewer datastore ops).
Make decoder scoring MUCH faster
Update schema: Assignments will be associated to Handle entity, not user
Assignment depends on handle, not user
Add admin-controlled handles
Distinguish expired/ current on upload form
Deadline_passed now computed on the fly rather than statically when code loads
Merge pull request #4 from alopez/master

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