Mesh2Mesh and Combo Map examples.

Also fixed plotting codes to show the plots by default.

docs/content/examples/Inversion_IRLS.rst

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+.. _examples_Inversion_IRLS:
+
+.. --------------------------------- ..
+..                                   ..
+..    THIS FILE IS AUTO GENEREATED   ..
+..                                   ..
+..    SimPEG/Examples/__init__.py    ..
+..                                   ..
+.. --------------------------------- ..
+
+
+Inversion: Linear Problem
+=========================
+
+Here we go over the basics of creating a linear problem and inversion.
+
+
+
+.. plot::
+
+    from SimPEG import Examples
+    Examples.Inversion_IRLS.run()
+
+.. literalinclude:: ../../../SimPEG/Examples/Inversion_IRLS.py
+    :language: python
+    :linenos:

docs/content/examples/Maps_ComboMaps.rst

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+.. _examples_Maps_ComboMaps:
+
+.. --------------------------------- ..
+..                                   ..
+..    THIS FILE IS AUTO GENEREATED   ..
+..                                   ..
+..    SimPEG/Examples/__init__.py    ..
+..                                   ..
+.. --------------------------------- ..
+
+
+
+Maps: ComboMaps
+===============
+
+We will use an example where we want a 1D layered earth as
+our model, but we want to map this to a 2D discretization to do our forward
+modeling. We will also assume that we are working in log conductivity still,
+so after the transformation we want to map to conductivity space.
+To do this we will introduce the vertical 1D map (:class:`SimPEG.Maps.SurjectVertical1D`),
+which does the first part of what we just described. The second part will be
+done by the :class:`SimPEG.Maps.ExpMap` described above.
+
+.. code-block:: python
+    :linenos:
+
+    M = Mesh.TensorMesh([7,5])
+    v1dMap = Maps.SurjectVertical1D(M)
+    expMap = Maps.ExpMap(M)
+    myMap = expMap * v1dMap
+    m = np.r_[0.2,1,0.1,2,2.9] # only 5 model parameters!
+    sig = myMap * m
+
+If you noticed, it was pretty easy to combine maps. What is even cooler is
+that the derivatives also are made for you (if everything goes right).
+Just to be sure that the derivative is correct, you should always run the test
+on the mapping that you create.
+
+
+
+.. plot::
+
+    from SimPEG import Examples
+    Examples.Maps_ComboMaps.run()
+
+.. literalinclude:: ../../../SimPEG/Examples/Maps_ComboMaps.py
+    :language: python
+    :linenos:

docs/content/examples/Maps_Mesh2Mesh.rst

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+.. _examples_Maps_Mesh2Mesh:
+
+.. --------------------------------- ..
+..                                   ..
+..    THIS FILE IS AUTO GENEREATED   ..
+..                                   ..
+..    SimPEG/Examples/__init__.py    ..
+..                                   ..
+.. --------------------------------- ..
+
+
+
+Maps: Mesh2Mesh
+===============
+
+This mapping allows you to go from one mesh to another.
+
+
+
+.. plot::
+
+    from SimPEG import Examples
+    Examples.Maps_Mesh2Mesh.run()
+
+.. literalinclude:: ../../../SimPEG/Examples/Maps_Mesh2Mesh.py
+    :language: python
+    :linenos: