Merge branch 'v1.3.x'
Update CONTRIBUTING.md

added contrubution license
Update CONTRIBUTING.md
made MIT and BSD licenses explicitly ok
made initial licenses more broad
split contributer agreement in it's own section again
fix typo
Add cgompi and cgoolf toolchains
Add cgmpich and cgmpolf toolchains
fixed typos
Merge pull request #587 from JensTimmerman/develop

Update CONTRIBUTING.md
Remove irrelevant and commented-out code
Ensure that the correct package name is used ('GCC')

In Clang-based toolchains, COMPILER_MODULE_NAME includes two items: 'Clang' and
'GCC'
Use correct class name
Don't set Fortran-related variables in the Clang compiler module
Derive toolchain classes from ClangGcc instead of both Clang and Gcc
Don't set COMPILER_FAMILY in Clang compiler class

Clang does not have Fortran support, and thus it is not a complete compiler as
far as EasyBuild is concerned.
Set COMPILER_FAMILY in ClangGcc because it is a complete compiler, including
Fortran support
Verify that CC and CXX are set correctly
Explain why 'GCC' is hardcoded