employment and education update

- added: applicants can now fill out between zero-three past employments
- added: applicants can now fill out between zero-three past educations
- the only major required fields checked are employer name, employer
address, school name, and school address (these fields let the
application form know if we are saving other
employment/education-related fields from the application form...)
- also, cleaned up the employment and education code in
KaskKiosk/Controllers/AppController.cs (loops implemented for form
items... in theory, we could have as many as we want, now... but the
requirements only state the need for three employments, three
educations...)