Adds how to apply to posting

## Adds How to Apply
## Form
![screen shot 2014-03-15 at 5 10 30 pm](https://f.cloud.github.com/assets/2747762/2429513/a2bd2e68-ac86-11e3-9925-b2ac645a4ee2.png)
## Job Post #show
![screen shot 2014-03-15 at 5 17 08 pm](https://f.cloud.github.com/assets/2747762/2429519/32282080-ac87-11e3-80a0-f59dfdcc1baa.png)

To-do
- [x] Add how to apply
- [ ] Make the 'How to apply' section highlight links, emails.