Added "loopBlendTime" property for animation clips to support interpolating between the end points of an animation clip when looping. This allows clips to animate smoother when the end points of a clip do not exactly match up (which is all too common with animated character content).

A new overloaded version of Curve::evaluate was also added to support this feature.

gameplay-encoder binary was updated for windows, but still needs to be updated for mac and linux.
Merge branch 'next' of https://github.com/blackberry/GamePlay into next
Changed Game::exit() to only perform a full shutdown when either FORCE_CLEAN_SHUTDOWN or GAMEPLAY_MEM_LEAK_DETECTION are defined. By default now (when these are not defined), it simply calls cstdlib ::exit(0), which causes immediate termination of the application. This was done to avoid extremely long shutdown times when trying to do cleanly delete every last pointer in the system, especially for large games. Any modern OS handles reclamation of memory, so there should be no adverse side effects.
Merge pull request #856 from sgrenier/next

Added support for smoothing endpoints of animation clips