- This calls `VTKRenderer::setRenderWindow`. Needed to use a
vtkRenderWindow from another instance (example : for a QT
application, use QVTKWidget renderwindow)
- Rename `VTKViewer::getRenderWindow` to `getVtkRenderWindow`
- Use internal functions in `getVtkCamera` and `getVtkRenderer`

Many are formating changes and others are
bug fixes as well as some refactoring.

from SimMedTK to iMSTK.

Modify the license notice in each file.
Add LICENSE file.

from SimMedTK to iMSTK.

Modify the license notice in each file.
Add LICENSE file.

by examples and unit tests.

Revert some changes and make it build, run FEMSimulator example

CollisionContext/CMakeLists.txt was contributed by Sreekanth.

Cherry-picked from Ricardo's edits to MeshMap related
classes in addCollisionContext branch

BUG: Fix compilation errors all over the place

ENH: Adds code to find islands

Adds code to find and list members of islands

WIP: Adds code to do stage-2 assembly

ENH: Change the mesh representation of scene objects

Adds three mesh representations for discrete geometry
for each scene object. Also adds mesh maps

Conflicts:
	Assembler/Assembler.h
	Collision/MeshToMeshCollision.h
	CollisionContext/CollisionContext.cpp
	CollisionContext/CollisionContext.h
	Core/AnalyticalGeometry.h
	Core/SceneObject.cpp
	Core/SceneObject.h
	Mesh/MeshMap.cpp
	Mesh/MeshMap.h
	Mesh/MeshMapAffine.cpp
	Mesh/MeshMapAffine.h
	Mesh/MeshMapTetToSurface.h
	SceneModels/UnitTests/VegaFEMDeformableSceneObjectSpec.cpp

Add an alias for a matrix map.
Create a templated method in the MeshModel and IOMesh to automatically
cast the underlying mesh.

Create an interpolate() method in the VegaVolumetricMesh class to
interpolate surface of the underlying volumetric mesh with an external
surface mesh and clean up the interface.

Create a computeGravity() method in the VegaVolumetricMesh class
to compute gravity forces.

Refactor getVelocity() method in DeformableSceneObject and add a
variable to hold the gravity vector.

Refactor SceneObject. Add SceneModelRenderDelegate render delegate to
take care of renderign operations for this model. Create visual,
physics and collision model variables.

Remove render delegates from the StaticSceneObject, this is now handled
by it base class.

Add storage for the gravity force in VegaFEMDeformableSceneObject and
initialized properly. Compute internal force by multiplying K*positions
instead of calling the vega function.

Refactor DefaultSimulator, VegaFEMModelSimulator. This class will be
marked obsolete soon.

This will be the main render delegate since only models are allowed to
be render and this one covers most cases.

classes. Also create a SimulationManager in charge of
running the simulation.

- Migration of the camera update by external device
from VTKViewer to LaparoscopicCameraController.
- Removal of obsolete cameraConfigurationData struct
- Cleaning of unused variables and of style
- Simplification of the cameraController feature
in the LaparoscopicCamera example.

- Also replace GL/glew by vtk_glew in Core/RenderDetail
- Remove empty first line in those

The 3ds file loading and attachment  of VAO for the tangents
for 3DS file are working fine now.

The renderdetail has been changed to accommodate these modifications.
The wet shader shader code is a bit modified.

Clean-up of the code is needed

The tangents transfer to the shaders need to be checked.

Needed for custom shader attribute declarations such as tangents.

The camera clipping range was not updated after its position was
changed by the cameraController, resulting in cropped actors by
the 'far' plane if the camera was pulled too far away from the
models.

This commit adresses issue #56

The reason why the libusb1 was not found by find_* was
strangely because of the veriable name. Seem that find_*
do not like numers in the name.

Fix rebase conflicts.

of the vtk's windowToImageFilter

TODO:
Get it to render circle.

Camera scope tip bending works!

Sets the appropriate view angle for the camera.

Conflicts:
	Examples/LaparoscopicCamera/main.cpp
	VTKRendering/VTKViewer.cpp
	VirtualTools/LaparoscopicCameraCoupler.cpp