Add test that fails on Railo for #37
Fix for constructor args with missing beans

Return an empty structure when argument does not have a correspodning
bean to ensure that it does not have a value set.
Add a third test with "bookended" args

Just testing the case where there's a bean, no bean and then bean
again to make sure that the fix hasn't introduced any issues
in that case.
Remove incorrect comment from latest test
Merge pull request #42 from marcins/issue-37-defaultargs

Add useful tests for debugging #37