Merge pull request #584 from boegel/v1.3.x

release notes for v1.3.0
Merge branch 'v1.3.x' of github.com:hpcugent/easybuild-framework into v1.3.x
bump version to 1.3.0, ready for release
Merge branch 'v1.3.x'
Merge pull request #586 from boegel/master

v1.3.0 release
bump version to v1.3.1dev