Avoid info errors on deftype generated classes

Guard the call on the package name in utils.java.  It seems deftype
classes return nil for getPackage.
Add test for info-clj with deftype in ns

deftype and defrecord define classes on which getPackage returns nil.
Ensure this does not cause problems.
Merge pull request #127 from hugoduncan/guard-get-package

Avoid info errors on deftype generated classes