Rename ajax response data -> program
Store draft classifications in separate object in Program

* Drafts are stored in Program.draftClassification[user._id] so have multiple draft classifications, one per user
* Draft is moved to Program.classifications[0] on register
Cleanup unused classification status text methods
Fix form labels
Fix re-reclassification failing to create draft

* When modifying existing schema.Any-types, need to call markModified to make mongoose propagate changes to db.
Fix finding previous email recipients of classification

_.(classifications).filter(fn) returned a chainable lodash "monad", not an array. Sorry.
Merge pull request #4 from kavi-fi/feature/draft-classifications

Feature/draft classifications