Upgrades Gmaps4rails

We're blocked on our rails 4.1 branches with failing jasmine test suites. In this past, we relied on [a hack to get jasmine working with version 1.5.6 of gem `gmaps4rails`](https://github.com/AgileVentures/LocalSupport/commit/99fc4bf7239806b7864dcedab5a9cd8198b0661b), but this no longer seems to work with rails 4.1. Rather than extend the hack, let's just upgrade our `gmaps4rails` gem. Hopefully this will resolve the conflict.

TODO:
- [x] get new maps working
- [ ] configure map options (center, infowindow)
- [ ] update tests
- [ ] DELETE JASMINE RAKE TASK!