Added scanners for best practices and security.

Run the rake tasks to execute the scanners:
rake brakeman
rake rails_best_practices
Moved rails secret token into the environment.
Can now search by location and technologies.

UI now has a field to specify the location of the search.
JS updated to pull from these fields and pass the values as search
criteria to the backend.
Display a popup when no results are returned.
Get rid of onmove handler.

Now that the map pans to the bounds of the search results, loading new
results as the map moves makes less sense. This also resolves the
related issue of needing to only add newly visible markers while
retaining the old ones so that popups are not suddenly closed when
panning.
Removing unused code path.
Updating leaflet.
App now works on my Galaxy Nexus.
Refactor controllers to use user_email in session.