Allow Drupal views to be used for Notes related to contacts

This patch allows Notes related to a contact to be used in Drupal views. The desirability of this feature was discussed in https://forum.civicrm.org/index.php/topic,22331.msg113314.html#msg113314

Steps to verify:
1. Apply patch
2. Create a Drupal View to display CiviCRM Contacts
3. Add new field to the view, filter by Civicrm Note and select Note
4. Finish adding field
5. Any notes for contacts now show up in the appropriate row(s)

I have verified this in 4.3.8.
It looks like this would also work in 4.4, added to drupal/modules/views/components/civicrm.core.inc , but I have not verified it there.