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New Modeling Kernel
-------------------

This commit adds a new modeling kernel based on
[Boost.polygon](http://www.boost.org/doc/libs/1_58_0/libs/polygon/doc/index.htm).
It currently supports a very limited set of operations:

+ Creation a model.
+ Creation of model vertices.
+ Creation of model edges.

Internally, an edge split operation is provided but not yet exposed.

Miscellany
----------

+ Fix a bug in attribute association.
  Because model entity items in attributes may have a membership mask,
  calling `setValue()` does not guarantee that the association will
  occur. Return the proper boolean or infinite recursion will occur
  inside `Attribute::associateEntity()`.
+ Add a Python-callable variant of ImportJSON::ofLog.
+ Have `smtk.simple` hang on to operator results so that scripts can access them if they need to.
+ Fix error log printout in `smtk.simple` API.
+ Have python test `addToScene()` method return pipeline objects.

SMTK currently requires a ParaView build directory, at least on
Mac OS X, because ParaView does not install properly.
Fix the `PYTHONPATH` for testing to include the `lib/site-packages`
directory so that `import vtk` can work and image-based tests run.

This branch includes initial support for helical sweeps,
but be aware that only Cubit/ACIS support this kind of
sweep; the CGM OpenCascade backend does not yet perform
sweeps.

This also fixes a bug in `ModelEntityItem::appendValue()`.
This bug causes issues when `Operator::associateEntity()` is
called and the association has a minimum number of expected
values; because there are not default UUID values, the first
numberOfValues() entries are null UUIDs; the associated entity
is appended to the end of this array, which leaves null values
at the front of the array. So, even though it is slow, we must
verify that existing slots for model entities are actually in use.

Finally, this branch tweaks the smtk.simple API a little bit:

* Add CreateCylinder to simple python API.
* Solid modeling operations print the error
  log when an operation does not succeed.

Finding the python interpreter and preparing the test environment
should happen once at the beginning of the configuration step.

... to test vertex, edge, and face creation.

These tests use the CGM operators from Python.

At the same time we move them into a language specific directory that follows

John Tourtellott authored May 28, 2014 and David Thompson committed Jun 04, 2014

Seems klugier than it needs to be...

This makes it much easier for Bridge subclasses to create
cell-use records with specified UUIDs. This should also
improve (shiboken-generated) Python-wrapper code coverage.
Slightly.

Expose more relationships in the UI and continue
fleshing out the cursor subclasses.

This implements InstanceEntity methods in a way that
will not conflict with groups.