The Cancel button on the Edit Wiki page was still redirecting back
to the "Index" page which is no longer the default Wiki page.
This commit changes the Cancel button in the following ways:
* Pressing Cancel while editing an existing Wiki page will now
redirect you back to the latest version of that page.
* Pressing Cancel while editing a brand new Wiki home page that
does not yet exist will redirect you to back to the same Edit
Wiki Home page.
This commit replaces the old database backed Wiki system with the
excellent Gollum git based Wiki system.
The UI has been updated to allow for utilizing the extra features
that Gollum provides. Specifically:
* Edit page now allows you to choose the content format.
* Edit page allows you to provide a commit message for the change.
* History page now shows Format, Commit Message, and Commit Hash.
* A new Git Access page has been added with the Wiki Repo URL.
* The default page has been changed to Home from Index to match
the Gollum standard.
The old Wiki model has been left in tact to provide for the
development of a migration script that will move all content stored
in the old Wiki system into new Gollum Wikis.
