Update base controller to check for outdated browser.
Update base controller to check for outdated browser.

podemos-info/loomio,travis-repos/loomio,podemos-info/loomio,rafacouto/loomio-bak,rafacouto/loomio-bak,podemos-info/loomio,rafacouto/loomio-bak,travis-repos/loomio