Enable customization of Login screen

[GoogleCodeExporter]

It would be nice to be able to perform basic customization of the login screen, 
similar to how we can customize the header and footer. Specifically the screen 
that appears when the user clicks sign-in and is presented with a login prompt.

Use Case:
We're using LDAP for authentication and would like to provide a "Forgot 
Password" link which routes to our own password reset page.

Original issue reported on code.google.com by zxi...@gmail.com on 3 Jul 2013 at 3:03

[GoogleCodeExporter]

Another use case that I have is a note to specify which domain's credentials to 
use.  At my company there exist several Active Directory domains and it is 
unclear which one's credentials one is expected to enter.  I'd like to leave a 
little message on the login page like "Use your corporate domain credentials to 
log in".  Thank you.

Original comment by denver@sleepydragon.org on 8 Aug 2013 at 1:33

[GoogleCodeExporter]

In our case, we have an in-house OpenID provider. It would be nice to be able 
to provide a link directly to our OpenID server.

Original comment by pedah...@gmail.com on 1 Apr 2014 at 5:04