Merge pull request #1 from danjacka/master

plone.app.registry README tweak
Preparing release 1.1
Bump version to 1.1.1
Adding form.extends to control panel doco from z3c.form
Remove unused zope.app.component import.
use lxml instead of elementtree
add interface to search and page through registry settings
Allow deletion of records by interface.
Add tests for deletion of records by interface.
Update changelog.
Update documentation.
Fix tests.
Merge pull request #2 from plone/newui

add interface to search and page through registry settings
Deprecate 'delete' in GS XML in favour of 'remove', which is more
standard.
Update documentation.
Continue to cover deprecated attribute with some tests.
Fix deprecation warning messages.
Preparing release 1.2a1
Back to development: 1.2a2
Records without interface bailed out: AttributeError: 'NoneType' object has no attribute 'split'