fix(build): Downgrade imagemin
chore(install): Update npm-shrinkwrap.json for the downgraded grunt-contrib-imagemin
Merge pull request #1137 from mozilla/issue-1129-install

Issue 1129 install

Thanks for tracking this down @vladikoff! r+
docs(README): mention default port number
fix(test): Removed 'npm run test-browser'. Combined into 'npm test'
Merge pull request #1143 from vladikoff/remove-intern-browser

fix(test): Removed 'npm run test-browser'. Combined into 'npm test'

lgtm, thanks @vladikoff!
feature: Add metrics gathering.

* Use SpeedTrap to collect client side metrics
* Add screen views and errors to an event stream.
* Metrics are sent to the `/metrics` endpoint on document unload.
* Data that is sent to the backend is filtered - only data we expect is sent.
* auth-errors.toMessage now accepts `forceMessage`