The idea here is to have both discard and draft banners on the window so that by using jQuery we can hide/show the appropriate banner instead of fully re-loading the page.

Note- Testing pertains banners only and it was performed as follows:
-Analyse expected behaviour of a review request's state in demo.reviewboard.
-Reproduce the review request's state locally making sure it behaves as expected(minus the page reload).

* Brand new, not yet published:
Discard-Review-Request button: draft-banner and "close" option in the nav bar hide. Discard-banner shows 
Discard-Review-Request link: draft-banner and "close" option in the nav bar hide. Discard-banner shows.
Publish button: draft-banner hides and review-request gets published as expected.

* Published and unchanged
None of the banners are displayed- as expected.

* Published with a change causing a draft
Draft-banner is displayed as expected.
"ok" button: saves description entered as expected
"cancel" button: description entered is discarded as expected
"publish changes" button: draft banner hides and request is published as expected.
"discard changes" button: draft banner hides and request is discarded as expected.

* Discarded
discard-banner is displayed as expected.
"ok" button: saves description entered as expected
"cancel" button: description entered is discarded as expected

* Reopened after discarded
"reopen for review" button: discard-banner hides, draft-banner is displayed and request becomes a draft.

* Submitted
submitted-banner is displayed as expected.
"ok" button: saves description entered as expected
"cancel" button: description entered is discarded as expected

* Reopened after submitted
-submitted request was previously a draft: "reopen" button hides submitted-banner and displays draft-banner
-submitted request was previously public: "reopen" button hides submitted-banner.