added empty and not empty to DefaultConditionThings
added empty and not empty to DefaultConditionThings
Merge remote-tracking branch 'origin/empty_and_not_empty' into empty_and_not_empty

Conflicts:
	When/src/main/java/houtbecke/rs/when/DefaultConditionThings.java
	When/src/test/groovy/ThingsTest.groovy
simplified
simplified
Merge remote-tracking branch 'origin/empty_and_not_empty' into empty_and_not_empty

Conflicts:
	When/src/main/java/houtbecke/rs/when/DefaultConditionThings.java
Merge pull request #3 from jaspervp/empty_and_not_empty

Added empty and not empty to DefaultConditionThings