TESTS: Deleted the extra test_jv.py file.  Should only be in tests_models directory.
TESTS: Deleted the extra test_jv.py file.  Should only be in tests_models directory.

gxxjjj/QuantEcon.py,oyamad/QuantEcon.py,gxxjjj/QuantEcon.py,dingliumath/quant-econ,oyamad/QuantEcon.py,chenxulong/quanteco,jviada/QuantEcon.py,QuantEcon/QuantEcon.py,jviada/QuantEcon.py,QuantEcon/QuantEcon.py,andybrnr/QuantEcon.py,chenxulong/quanteco,agutieda/QuantEcon.py,mgahsan/QuantEcon.py,andybrnr/QuantEcon.py,dingliumath/quant-econ,mgahsan/QuantEcon.py,agutieda/QuantEcon.py