Reuse code in AdminEntryView(for creating a blog entry) and AdminEditView(for editing a blog entry)

Blog create page and edit page has a lot in common. Keep the common code
in a superclass and let these two views extend from that class.
Merge pull request #55 from agiliq/reuse_code

Reuse code in AdminEntryView(for creating a blog entry) and AdminEditVie...