adding trailing / to avoid 301 from append slash
change requirements line for pika to use git https clone, as many corporates' firewall blocks the port for git protocol.
Add myself to AUTHORS.
Merge pull request #87 from edx/e0d/update-login-url

adding trailing / to avoid 301 from append slash
Merge pull request #84 from xiangjf/xiangjf/change-requirements-to-use-git-https-clone

change requirements to use git https clone