Correct the way of skipping plotting tests.
tree9ad8c75aea3c0ee1890840193628698fe824731f
-rw-r--r-- 1503 LICENSE
-rw-r--r-- 139 MANIFEST.in
-rw-r--r-- 2966 README
-rw-r--r-- 189 TODO
drwxr-xr-x - bin
drwxr-xr-x - doc
drwxr-xr-x - examples
-rwxr-xr-x 7885 setup.py
drwxr-xr-x - sympy