First round of refactoring application.js. DMPRoadmap/roadmap#431 ...

Finished refactoring of application.js by transferring logic to more appropriate places. DMPRoadmap/roadmap#431

updated names of files, consolidated new css, added accessible submit to contact us page

merged in latest changes from rework-create-plan

switched from using clickable to aria-disabled for submit button

simplification of create plan js and html presence of plan_template_id triggers submit button disabled

added an accessible_submit_button widget that displays a tooltip and cancels click event when button is disabled