Govspeak for view templates.

- Add govspeak gem
- Register govspeak as a handler for view templates ending in `.md`
Good point. Will rewrite.

_Side note_: the docs on [Enumerable#find](http://www.ruby-doc.org/core-2.1.5/Enumerable.html#method-i-find) are slightly misleading on the `ifnone` optional argument. 

 > If no object matches, calls ifnone

actually means: if `ifnone` is set `ifnone.call` i.e. it has to be something that responds to `call`

```ruby
[1,2,3].find(->{}) { |i| i == 4 }
```