added customer helper
customer registration in magento now checks email against drupal users

fixed incorrect usage of HTTP_HOST

cleanup

updated error messages
added installation (.install) files
tons of whitespace/formatting changes
added full implementation of drupal user sync
- user registration form contains First Name / Last Name
- email address is used for login (thanks chris herberte & email_registration module)
- added `hook_registration_fields` for users to add any custom fields in magento user account