The vos.Client class has the fix_prop method twice.  They are identical 
except that one of them did not prefix the static class variable IVOAURL
with the class name, so it was a syntax error.

The incorrect and duplicated version of the method has been removed.
Updated test case related to cadc shortcut that was failing.
Merge pull request #11 from drusk/cadc_shortcut_test_failure

Updated test case related to cadc shortcut that was failing.
Merge pull request #12 from drusk/remove_duplicated_method

The vos.Client class has the fix_prop method twice.