import GLEW 1.10.0

note: GLEW header contains incorrect version information
build against the bundled GLEW rather than the system GLEW
Merge remote-tracking branch 'johnbartholomew/bundle-glew' into bundle-glew

Conflicts:
	COMPILING.txt
	Makefile.common
	configure.ac
	src/Makefile.am
force local glew headers to be used
add glew info to AUTHORS
add GLEW version to opengl.txt
Merge branch 'bundle-glew'