Add ability to set color for the scenario tags.
Ensure tag_fg_color and tag_bg_color are valid hex colors.
Add Spectrum as input[type=color] polyfill.
Fix tag colors label text.
Export/import scenario tag colors.
Merge branch 'master' into scenario-tag-color

Conflicts:
	Gemfile.lock
Allow nullable tag colors for the scenario
Add scenario_label view helper to render scenario tags.
Add spec for positive hex color value
Merge pull request #453 from PetroFeed/scenario-tag-color

Add ability to set color for the scenario tags.