[WIP] Pixel offset

It looks like the infowindow offset problem came up with the [small markers build](https://github.com/AgileVentures/LocalSupport/pull/102). The [custom builder](http://apneadiving.github.io/) example in apneadiving's in code sample page seems to suggest that the best way to handle the finer details of custom markers and custom infowindows is in conjunction with other 3rd party libraries for the google maps api. This is our first attempt to assemble something similar to what he demonstrates.

[Staged here](https://gmaps-upgrade.herokuapp.com/).