adding formula for glbinding

see https://github.com/hpicgs/glbinding
adding a super simple test
marking C++11 as required
fixing syntax pansen
C++11 also in install method
force clang, more respect for coding conventions
removed configure-call – it was useless
Update glbinding.rb

removed unneeded caveats
inlined variable "flags"
glbinding: add 1.0.2 bottle.