r: Link libraries, headers, & frameworks
r: Link libraries, headers, & frameworks

Link headers, libraries, & framework into normal locations on OS X
to allow other software to easily find them implicitly rather than
needing an explicit path upon compilation.

Prefer install_symlink over ln_s

Closes #1261.

pmelsted/homebrew-science,quantumsteve/homebrew-science,ge11232002/homebrew-science,goxberry/homebrew-science,heuermh/homebrew-science,joshbode/homebrew-science,dpo/homebrew-science,aeantipov/homebrew-science,pditommaso/homebrew-science,philippbayer/homebrew-science,DabeDotCom/homebrew-science,maplesond/homebrew-science,parcollet/homebrew-science,andrewjpage/homebrew-science,kozo2/homebrew-science,ahundt/homebrew-science