Merge branch 'geant4' of github.com:JensTimmerman/easybuild-easyconfigs into geant4

Conflicts:
	setup.py
style cleanup, fix easyblock used for GATE
style cleanup
fix libxml2 dependency, introduce 'arch' easyconfig parameter
style fixes
fix source_urls and sources spec for GATE
Merge pull request #2 from boegel/geant4

style cleanup + start using 'arch' easyconfig parameter for Geant4
Merge branch 'geant4' of github.com:JensTimmerman/easybuild-easyconfigs into geant4

Conflicts:
	setup.py
Merge pull request #69 from JensTimmerman/geant4

Geant4