Add support for defining an icon with a number of variants as well as a default.
Add docs.
Fix sp
Add variantName() method to consolidate the formatting for base name + variant name into compound icon variant name.
fix default icon w/o explicit configuration
Merge pull request #755 from sonatype/icon-container-variants

Add support for defining an icon with a number of variants
Merge remote-tracking branch 'origin/master' into nexus-5472-proxy404