bump version to v1.2.0
Merge pull request #519 from boegel/v1.2.x

bump version to v1.2.0
bump version to 1.3.0dev
Merge branch 'v1.2.x' into develop

Conflicts:
	easybuild/tools/version.py
Merge branch 'develop' of github.com:hpcugent/easybuild-framework into develop