slightly faster.

the BLAS bindings.

  describes the exact transformation used.
- Fixed a bug in rotate_image(), it returned a point_transform_affine object
  that did the opposite of what the specification said it returns.

object.

output pixel exactly the same way as defined by centered_rect().

visual studio 2010.  So I just replaced the uses of the typedef
with the actual type.

if no dynamic version of these libraries are installed on the system.

cmake can't find a copy to dynamically link to.  This is especially
useful on windows where cmake never finds libjpeg.