Remove JFactory from Form class.

Remove JFactory from Rule\Email. Remove unique check, because it's for the CMS.

Removing SQL field type. Create a custom field type instead.

Remove Factory from Field\Timezone. Fix usage of JHtml.

Remove tests.

Remove ComboBox field type. Unused and requires media.

More cleanup
Remove FormHelper proxy methods from Form class. Restructure UT's.
Fix merge conflicts.
Merge pull request #238 from dongilbert/bugfix-JForm

Clean up Form Package