Add yaml-cpp include directories fo examples

A couple of the examples (Fem3d, and MassSprings) did not have the
yaml-cpp include directories. When I added OctreeShape to the
CollisionLocation, suddenly the examples needed it (because of
serialization). This just adds the include directories to CMake.
Rename template parameters Octree

Changed the template parameters so they conform to the coding standards
(one upper case letter). The Data template parameter I left as data
since we do that in the vertex data structure.
Reduce copying the nodePath in OctreeDcdContact

To reduce the amount of copying of the nodePath, pass it by share_ptr.
Since all children are basically using the same path, we need to pop the
index as we come back up the tree.
Check OctreePath is valid in OctreeShape::getNode

Check that the lenght of the path given to the Node isn't longer than
the depth of the octree.
Handle VS2010 bug with make_shared as default parameter

Apparently VS 2010 has a bug when passing make_shared as a default
parameter. I was setting the default path in OctreeDcdContact to an
empty one with make_shared. Now, the default parameter is removed, and I
just pass in an empty path.
Fix failing OctreeShape test

Needed to set the root node, to be sure when I retreive it isn't
nullptr.
Fix type warning in BoxCapsuleContactCalculation

BoxCapsuleContactCalculation was using an int as a bool. When it really
should be a bool. This just changes it to the correct type.
Fix VS errors and warnings in OctreeContactCalculation

Visual studio doesn't like the struct initialization used in the tests.
So this removes them, and assigns the struct member values directly.

Also, fixed an error about ambiguous use of the pow function.