Created WIPMap to consolidate mapping functions and created a method to retrieve markers by bounding box.
Removed console logging statements.
Changed Google maps refresh event to "idle" to reduce server calls.

As found at http://stackoverflow.com/questions/17538581/google-maps-center-changed-is-firing-my-function-more-than-once
Merge branch 'refs/heads/master' into bounding_box_search