Updates stack versions in readme

Updates Ruby & Rails stack versions in readme to latest used versions.
Update compass-rails to 2.0.0

- Updates compass-rails to 2.0.0
- Updates compass to 0.12.7
Merge pull request #559 from codeforamerica/update-readme-stack

Updates stack versions in readme
Merge pull request #560 from codeforamerica/update-compass

Update compass-rails to 2.0.0
Updates map marker filename

Changes underscore to hyphen to be consistent with file naming
convention in other modules.
Adds applicationjs to all routes

application.js was excluded from the result and detail view routes.
This adds it to all route modules.
Merge pull request #563 from codeforamerica/applicationjs-all-routes

Adds applicationjs to all routes
Re-adds google translate dropdown only mode

Google Translate Widget Dropdown only display mode added in
https://github.com/codeforamerica/ohana-web-search/pull/540 appears to
have been inadvertently removed. This commit re-sets the dropdown mode
to dropdown only.
Refactors Google Translate code

- Moves Google Translate initialization to application.js so it’s
applied to all routes.
- Refactors Google Translate Manager to remove polling code and to
integrate Google supplied initialization scripts.