Bug fixes to ImageResource backend.
Merge branch 'resource-image' of github.com:blackhydrogen/noop-webvisual into resource-image

Conflicts:
	resource/image_resource.py
Merge branch 'resource-image'

Conflicts:
	resource/__init__.py
Fixed bug (is_valid_observation method) in image_resource.py.
Merge pull request #73 from blackhydrogen/resource-image

Fixed bug (is_valid_observation method) in image_resource.py.
Merge pull request #74 from blackhydrogen/boilerplate

Fixed bugs associated with tooltips and the tooltip toggle button