banner, host/port for docker pull advice and building behind a firewall

Hi,

I've made a few modifications:

* Couldn't build behind a corporate firewall due to the bower trying to access external ssh git repos
* Setting to customise "docker pull" advice in tag detail page
* Setting to add a banner/notice for information/documentation

Admittedly I've not done angular before so there may be some bad practices... let me know.