3263 Return changes to the form that got lost in a rebase/old branch

Stephanie and I had previous fixed the bad HTML and non-standard layout going on with the import form, but it got lost somewhere. This reapplies those fixes in addition to adding the requested required classes and indicators to the URLs, Author Name, and Author Email Address fields.

https://code.google.com/p/otwarchive/issues/detail?id=3263

Includes Stephanie's changes from https://github.com/otwcode/otwarchive/pull/1509

![import](https://f.cloud.github.com/assets/907055/2047962/d2a592d4-8a33-11e3-8fe0-4ca6de6a177f.png)