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?
@fgeorgatos python will expand `~` to $HOME if it is set, otherwise it will look the home dir up in `/etc/passwd`  and also do other tricks on windows. So it is prefered.