chatter community landing page

The challenge is to have our custom login page for customers/partner on chatter community to maintain our company branding.

Steps to accomplish this:-

1. We should have force.com site enabled for chatter community. 
2. Then we need to do few changes in "communitieslandingcontroller" method as below to get our custom visualforce page as default landing page.Here "communitieslandingcontroller" is added to our org when we enable community. "Welcome" is our custom visualforce page with login form to community.We need to enable "welcome" page for the site as well.

         public PageReference forwardToStartPage() { 

                 Pagereference pa=new Pagereference('/welcome');
                 if(UserInfo.getUserType()=='Guest'){
                    return pa; 
                 }else{ 
                    return Network.communitiesLanding(); 
                 } 

            } 

So now when we enter <base url>/community name, we get our custom visualforce page instead of standard login page and from here we can login to communities.