Merge pull request #19 from jmay/master

Support for multi-valued address field; also record deletion
lossless round-trip attributes
adding support for ABGroup
adding members to groups
test cleanup, bump version
expose the -1 invalid UID to API users; use the UID as indicator of new/existing record
test suite now running through common AB object
wrap get-person-with-record-id
wrap find-by-id
moved addrbook class to own file
expose create & mod timestamps
Merge pull request #20 from jmay/master

full support for all the multi-valued elements
temp fix: blows up when NSDate properties are present
bump minor version
Merge pull request #23 from alexrothenberg/datefix

workaround for NSDate issue until proper solution is found
merged 1.1.1 datefix