add intel/2014b toolchain definition, which includes GCC/4.8.3 as a dependency

depends on https://github.com/hpcugent/easybuild-easyblocks/pull/429 to ensure that FFTW wrappers libraries for Intel MKL are installed correctly

@gjbex, @hajgato, @JensTimmerman: please review?
`os.path.expanduser("~")` is prefered over `os.getenv('HOME')`
But actually I would prefer using something like an INTELLICENSEFILE environment variable...