Enhc issues section

These are two new global css classes to create the issues section. Also
added breakpoints for these, they are working well on mobile.

TODO add breakpoint for section starter

I think I remember seeing mobile mocks somewhere, but I can't find the file again. In that case, these breakpoints might not be what we had designed, so I'll have to check that out.


sm breakpoint
![screen shot 2014-10-31 at 3 01 18 pm](https://cloud.githubusercontent.com/assets/1701077/4869373/024edd4c-614d-11e4-8dd3-68e6acfdf3bb.png)


md breakpoint
![screen shot 2014-10-31 at 3 01 38 pm](https://cloud.githubusercontent.com/assets/1701077/4869376/07589a62-614d-11e4-99c6-fd58da47c19d.png)

lg breakpoint
![screen shot 2014-10-31 at 3 01 48 pm](https://cloud.githubusercontent.com/assets/1701077/4869382/105f0a74-614d-11e4-803b-6570326067f0.png)