Merge pull request #234 from nyue/master

Fix typo in comments about FindAppleseed.cmake
completely reimplemented renderer::TransformSequence::compute_motion_segment_bbox() using a simpler and more general algorithm based on numerical root finding.  this algorithm handles linear scaling in addition to rotations (translations will be implemented next).  this fixes the massive slowdown reported by Haggi with a scene containing thousands of scaled, moving assemblies.

also added and tweaked unit tests.

what remains to be done:
  - handle translations
  - switch to Newton's method for root finding
  - move all root finding code to a separate module in appleseed.foundation
  - optimize the code and tweak the performance- and precision-related constants
  - clean up the code
refactored and cleaned up the new implementation of renderer::TransformSequence::compute_motion_segment_bbox().  as a test, this code is using C++11 features (lambdas).
moved the root finding codes to foundation/math/root.h.
updated devkit packaging scripts (they will soon be removed in favor of CPack).
added a root finder based on Newton's method.
avoid std::function<> because it incurs a large performance penalty (10% in the case of renderer::TransformSequence::compute_motion_segment_bbox) as explained in this article: http://www.drdobbs.com/cpp/efficient-use-of-lambda-expressions-and/232500059.
switched to Newton's root finder and further simplified and cleaned up the code.
added unit benchmark for renderer::TransformSequence::compute_motion_segment_bbox().
replaced the foundation::Transform constructor taking a single local-to-parent matrix by a static method as to make the runtime cost of this operation more explicit, and updated the rest of the code accordingly.
optimized renderer::TransformSequence::compute_motion_segment_bbox().
minor tweaks.
updated devkit sample.
migrated the Visual Studio solution for the devkit sample to Visual Studio 2012.
updated devkit packaging script.
Merge remote-tracking branch 'upstream/master'
Disable running of unit benchmark as part of CTest