Modify login page and setup pages for new layout

Create separate django templates for login page, setup pages, and
logged in pages
Use appropriate redirects on login, and setup completion so that
correct backend templates are loaded
Login page changes for new layout

Add separate container for login area
Merge branch 'issue#230_login_layout' of git://github.com/sujeetsr/rockstor-core into sujeetsr-issue#230_login_layout