Release Name: 0.4

Notes:
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Ruby OpenCL Library (Ruby-OpenCL) 
Release Notes
Release Ruby OpenCL 0.4 (Beta)
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Installation Instructions
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* unzip and untar the source file.
  $ tar zxvf ruby-opencl-0.4.tar.gz
* go into the directory.
  $ cd ruby-opencl-0.4
* run extconf.rb
  $ ruby extconf.rb --with-OpenCL-include=/path_to_directory_having_CL/cl.h --with-OpneCL-lib=/path_to_directory_having_libOpenCL.so
* execute make
  $ make
* install to system as root
  # make install



Changes:
	* Version 0.4 released.
	* bugfix in OpenCL::ComanndQueue#enqueue_(read|write)_buffer
	* change error messages