cylc images: svg icon
Remove task name case check and warning; closes #435.
Merge pull request #433 from benfitzpatrick/images.add-svg

cylc images: svg icon
Use Ben's new svg icon in gcylc.
Merge pull request #437 from hjoliver/use-svg-icon

Use Ben's new svg icon in gcylc.
Merge pull request #436 from hjoliver/435-remove-case-check

Remove task name case check and warning; closes #435.