Put utils in their own folder. Increases organization, and everything will be available under SimPEG.utils

NOTE: if you add a new function (or file), you must register it in __init__.py for it to be available under:

e.g.
...
from utils import mkvc, …
...
from MYNEWFILE import MYNEWFUNCTION

SimPEG/__init__.py

@@ -1,4 +1,3 @@
 from TensorMesh import TensorMesh
 from LogicallyOrthogonalMesh import LogicallyOrthogonalMesh
 import utils
-from exampleGrid import exampleLomGird