map ctrl-p to opening autocomplete menu for a field

and other keystrokes to closing the menu, if it's open
cache classifications to localStorage as they are saved
add data-title field to select menu for date-input-template
get the guide title for a given input field into the transcriberWidget.model
add autocomplete widget to input fields, which can be triggered by TranscriptionController

change attr("class") test to hasClass() because jquery autocomplete
appends classes
set the data-title field to the model title when title is changed
add helper methods to retrieveClassificationEntries by fieldname, and
to populate a set of input fields with a given splittable value (e.g.
split a date into 3 input fields for month/day/year)