Adds paging ability

Adds option to set page parameter in the URL to move query through
result pages.
Fixes map error

If none of the results had lat/long coordinates mapbox would throw an
error. This commit adds conditional code to prevent am empty result set
from being handed to mapbox.
Adds placeholder pagination links

Adds links for next and previous pagination, which are currently
non-functional.
Adds placeholder AJAX links

Adds initial links for enabling ajax pagination navigation.