Update map component

[jamiefolsom]

Neatline currently uses the OpenLayers library, version 2.0 for map rendering. We will consider updating to the most recent version of that library, as well as switching to another library.

Beyond supporting existing Neatline features, any library to be used in the new map component must support a migration path for existing exhibits. Given that OpenLayers version 3 does not support Google maps, and many exhibits use Google maps base layers, we must find a way for those exhibits to continue to work.

In addition, the new version of the map component should make it possible to view, navigate, and search an exhibit using a small screen with a touch interface.

There exists a range of web mapping libraries, and systems and tools with which composite maps are built. We will consider the options available, in addition to OpenLayers version 3, including:

• Leaflet.js (high-level, dedicated front end web mapping library)
• Mapbox (full stack mapping platform)
• CartoDB (full stack mapping platform)
• D3 (low-level front end visualization library)