Add compilation support for OSX

- need to recheck exact ROOT dependencies
- support LANGUAGE source file property for cuds files
  (build everything using nvcc on OSX)
fix compilation errors related to clang on OSX
Add convenient method in PdfBase for getParameters
some clean up in GooBDecayPdf

- remove unused members (we access them by using
  host parameters array anyway)
- clamp analytic integral for lo < 0, so lo >= 0
hopefully temporary hackery in cmake files
Merge branch 'bdecay' of https://github.com/apriori/GooFit into bdecay

Conflicts:
	CMakeLists.txt