organizing the docs - put the content in a content folder. put the SimPEG core api docs in core_api

docs/content/api_core/api_Utils.rst

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+Utils
+*****
+
+.. automodule:: SimPEG.Utils
+    :members:
+    :undoc-members:
+
+Matrix Utilities
+================
+
+.. automodule:: SimPEG.Utils.matutils
+    :members:
+    :undoc-members:
+
+
+Solver Utilities
+================
+
+.. automodule:: SimPEG.Utils.SolverUtils
+    :members:
+    :undoc-members:
+
+Curv Utilities
+==============
+
+.. automodule:: SimPEG.Utils.curvutils
+    :members:
+    :undoc-members:
+
+Mesh Utilities
+==============
+
+.. automodule:: SimPEG.Utils.meshutils
+    :members:
+    :undoc-members:
+
+Model Builder Utilities
+=======================
+
+.. automodule:: SimPEG.Utils.ModelBuilder
+    :members:
+    :undoc-members:
+
+Interpolation Utilities
+=======================
+
+.. automodule:: SimPEG.Utils.interputils
+    :members:
+    :undoc-members:
+
+Counter Utilities
+=================
+
+.. code-block:: python
+    :linenos:
+
+    class MyClass(object):
+        def __init__(self, url):
+            self.counter = Counter()
+
+        @count
+        def MyMethod(self):
+            pass
+
+        @timeIt
+        def MySecondMethod(self):
+            pass
+
+    c = MyClass('blah')
+    for i in range(100): c.MyMethod()
+    for i in range(300): c.MySecondMethod()
+    c.counter.summary()
+
+
+.. code-block:: text
+    :linenos:
+
+    Counters:
+      MyClass.MyMethod                        :      100
+
+    Times:                                        mean      sum
+      MyClass.MySecondMethod                  : 1.70e-06, 5.10e-04,  300x
+
+
+
+The API
+-------
+
+.. automodule:: SimPEG.Utils.CounterUtils
+    :members:
+    :undoc-members:
+