Final bugfix release for 3.1

The source code with submodules can be downloaded directly from the following link:
http://arrayfire.com/arrayfire_source/arrayfire-full-3.1.3.tar.bz2

Bug Fixes

• Fixed bugs in various OpenCL kernels without offset additions
• Remove ARCH_32 and ARCH_64 flags
• Fix missing symbols when freeimage is not found
• Use CUDA driver version for Windows
• Improvements to SIFT
• Fixed memory leak in median
• Fixes for Windows compilation when not using MKL #1047
• Fixed for building without LAPACK

Other

• Documentation: Fixed documentation for select and replace
• Documentation: Fixed documentation for af_isnan