Add yearless date as an acceptable format for moment parsing

Closes #2331
Fix mobile sidebar menu

Closes #3110
- Created `ApplicationView`
- Added `js-close-sidebar` classes to navbar navigation links
- Clicking on a navigation link in the sidebar will close it
Aditional classes in settings and invite user modal for the new form style
Merge pull request #3211 from novaugust/yearless-date-parsing

Add yearless date as an acceptable format for moment parsing
Merge pull request #3216 from novaugust/mobile-menu

Fix mobile sidebar menu
Merge pull request #3217 from PaulAdamDavis/new-form-style

New form styles