Add mechanics to generate a json or jsonp response.
Removed non-used ``locations.js`` file.
Update ``maps`` to use the ``json_response`` function.
Add helper method to expose the location dictionary.

https://github.com/madewithbytes/us_ignite/issues/167

The dictionary used has a common structure to be shown
in a map. The keys required are:
- type
- latitude
- longitude
- name
- website
- category
- image
- content
Add ``type`` field to the ``location`` endpoints.

The field has been added to match the new positions
to be created.
List upcoming ``Events`` in ``Hub`` related.

https://github.com/madewithbytes/us_ignite/issues/167

All the upcoming events related to a hub are listed in a
map. The events are loaded via JSON and executed with
a callback.