Do not bower install with npm install

### Problem

In many `npm` use cases (e.g., `browserify`) there is no reason to `bower install` since dependencies are brought in via `npm`.  In fact, without `bower` installed and configured, `npm install`ing a dependent of `angular-dynamic-locale` fails (bummer).

### Solution

`bower install` only when running tests for this repo, since that is the only time it's truly needed in the node/npm world.