Added user state field to task and code + specs for managing it via
params['u'], which should unmarshal to a hash
Setup @submit_to view variable for form path
moved task routing specs to spec/routing/
moved developer-facing README into doc/README_FOR_APP.md and made the toplevel README.md researcher-facing.  From now on please add developer-specific info to doc/README_FOR_APP.md.
merged with master