Added multi valued attributes support.
Fixed multi valued attributes split evaluation.

If an object contains a multivalued attribute (that is reprented
internally by a list object), split should no be done on the split
separator as we do for string uniquely defined attributes (split has
already been done by the user).
Levered leading `+` limitatinon in multi value.
Oops... forgot to update quick_tests.py :)
Removed unuseful [] on hard createed objects.
Merge pull request #984 from geektophe/multi_valued_attributes

Added multi valued attributes support