Added unique id field to grid and store.

This fixes a bug that was preventing multiple no features found rows from displaying.

It will also make sure that ID between layers don't collide and generally make me feel happy. :)
Added feature counts to grid headers.

Closes #86
Fixed reference to grunt-contrib-jasmine.
Fixed tests that were failing only when run in phantom.
Merge pull request #89 from agrc/result-count

Result count