For docker containers it would be useful if any configuration variables
defining how to connect to the angular ui and how it connects to the
DSpace 7 REST endpoint could be overriden by environment variables. We
should not extend configuration by environment variables too much.

Search service implementation

added support for Object.entries, removed a console.log and fixed an issue where the page wouldn't reset after selecting a new filter

Added docs about Angulartics providers

Added support for Google Analytics

Fix travis github ratelimit issue when downloading gecko webdriver

disabled the gecko webdriver, as we're not using it, and downloading it can cause rate limit issues on github