Update styling of asset type selection. Display normal full-range asset selection, but if there is a pre-selecet asset type, show only that asset as available. Includes a comparison operator handlebars helper. Addresses #381.
Simplify builder asset type selection template and view implementations. Suggested by @ghing. Addresses #381.
Remove unneeded compare handlebars helper.
Asset type list: Big + is clickable; toggles display of asset types. Addresses #381.
Asset type selection: bump up inactive/unavailable color darkness. Hide text except on hover, and only then for available types. Addresses #381.
Merge pull request #613 from patternleaf/381-asset-type-selection

381 asset type selection