/jobs

@kylerush 

- new layout jobs.hbs
- new page /jobs
- basic styles are done
- employee quotes, names, titles, image URLs in yaml file

TODO:
- actual jobs list is just placeholder text; needs to get hooked up to REST API
- current site shows random employee testimonials on refresh; I just have 4 employee quotes for now

issue https://github.com/optimizely/marketing-website/issues/13