flake8 cleanup on omeroweb/webstart
dev_5_0 specific cleanup
Add omeroweb/webstart flake8 check to travis
Update copyright year
Merge branch 'dev_5_0' into flake8-cleanup-webstart-dev50

Conflicts:
	components/tools/travis-build
Merge pull request #2332 from knabar/flake8-cleanup-webstart-dev50

Flake8 cleanup on omeroweb/webstart (dev_5_0)