Release following reliability focus.

Since the last build-cop version, updates include:

• support for loading multiple instances per user from storage
• updated freedom dependencies
• code coverage calculations when tests are run

Since the last v#.#.# release, updates include:

• move to Polymer + other significant UI refactoring
• updates of usage flow (including onboarding, auth, consent model, install)
• refitting code for uproxy-networking and freedom updates (including freedom 0.6)
• bug fixing, better error handling, more robust
• continued Firefox development
• UX-study-driven changes to UI