Deprecate DateMidnight
Ensure there is a max/min valid offset in DateTimeZone

Fixes #43
Fix to allow offsets from -00:01 to -00:59

Fixes #42
Update to time-zone data 2013d
Suppress deprecation warnings
Fix test case
Merge branch 'deprecate-datemidnight' of https://github.com/oby1/joda-time into oby1-deprecate-datemidnight
Complete deprecation of DateMidnight

Fixes #41