[CSS] Remove description for NIDOMs. Assorted refactors to allocate less CSS rulesets per DOM refresh.
[CSS] Do the importance sorting of selectors ahead of DOM-refresh-time for better refresh performance.
[CSS] Fix bug where ruleset orderings could be lost when combining rulesets.
[CSS] Make DOMs support multiple stylesheets. Remove the parent/child DOM relationship
[CSS] Combine view:hasCssClass: and view:hasCssId:.
[CSS] Clean up adding entries to NICSSRuleset.
[CSS] Pre-allocate NICSSRulesets for better DOM refresh performance.
[CSS] Make NIDOM make compound rulesets across all of its stylesheets for each selector.
Merge pull request #32 from djMax/so-fast

So fast