Added support for the CLIPS programming language

CLIPS or C language integrated production system is a tool for writing expert
systems.
Fixed an issue where the lexer was not explicitly stated for CLIPS
Treat .opencl files as OpenCL
Merge pull request #376 from evanmiller/detect-opencl

Treat .opencl files as OpenCL
Merge pull request #278 from DrItanium/master

Add support for the CLIPS programming language
Fix whitespace