ensure rules can access joda time packages (#572)

Fixes: https://github.com/openhab/openhab-core/issues/553

Signed-off-by: Markus Rathgeb <maggu2810@gmail.com>

bundles/org.openhab.core.model.rule/bnd.bnd

@@ -34,7 +34,8 @@ Import-Package: \
  org.apache.*,\
  org.eclipse.jdt.annotation;resolution:=optional,\
  org.eclipse.xtext.xbase.lib,\
- org.joda.*,\
+ org.joda.time,\
+ org.joda.time.base,\
  org.osgi.*,\
  org.quartz.*,\
  org.slf4j.*