create an empty whsc proposal form page
create the WHSC form
persist cart from whsc form
whsc: save cart properties
handle errors in whsc form
better display of multiple flash messages
refactor cart creation to happen in the form model
require sign-in for whsc
whsc: assign the requester to be the signed-in user
display success message when proposal is submitted
bootstrap-ify the whsc form
fix specs
refactor logic helper to not use instance variables
style more flash types
Merge pull request #138 from 18F/84702440_whsc_form

[#84702440] WHSC form