updates to 1.2 extensions, 2.0 extensions, and 2.1 api specs

- added description of devices associated with a program object
  created using clCreateProgramWithIL (public issue #4)
- added cl_khr_create_command_queue extension

specs/opencl-1.2-extensions.pdf

diff --git a/specs/opencl-1.2-extensions.pdf b/specs/opencl-1.2-extensions.pdf
index 293da68..0fa7867 100644
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specs/opencl-2.0-extensions.pdf

diff --git a/specs/opencl-2.0-extensions.pdf b/specs/opencl-2.0-extensions.pdf
index b19dcb8..b907439 100644
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specs/opencl-2.1.pdf

diff --git a/specs/opencl-2.1.pdf b/specs/opencl-2.1.pdf
index c160212..fcb010f 100644
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