Include jquery along with jquery-ui in edit_page.html

If we're going to use jquery-ui here, I think we should include jquery as well, instead of expecting it to be there. I just ran into an issue where my site's jquery version was not compatible with this version of jquery-ui. This fixes the issue.
Merge pull request #3 from nikolas/include-jquery

Include jquery along with jquery-ui in edit_page.html