Issue geometries displayed on a map in the issue details view.
Extracted zoom level to variable.
Leaflet icon configuration will not be compressed.
Map position moved below labels.

Rationale: map attribution text and labels were visually cluttered.
Improved CoffeeScript style and formatting.
Rearranged map position for visual clarity. Made map attribution text
optional.
Issue details map info popups.
Merge pull request #12 from tituomin/issue-details-map

Issue details map