Added path to show_markers method
Changed view files around:

- Removed plus link from trips#index
- Removed previous ajax link click call from trips#show to make more OOJS
- Added script tag to call all pins
Removed comments and test code from map-controller.js
Added new functions:

- Add function to load all pins
- Add generic ajax method
Merge pull request #115 from nealfennimore/features/map-model-js

Features/map model js