Job Board feature backlog

[theetrain]

In the wake of #72

• [ ] filterable tags (by clicking on your favourite tag OR specifying in the heading - make it accessible!
• [ ] location column (break up job post title)
• [ ] pagination
• [ ] search bar
• [ ] fade in job rows after initial load
• [ ] transitions between table and full job descriptions
• [x] history.js (for passing title and custom URLs to history.pushState)