Implement psuedoclass rewrite rules.

ISSUES: Plan psuedoclass lowering.

ISSUES: Text properties *mostly* implemented, upstreamed from Rhapsode core.

Substitute in counters for any CSS textual property, not just `content`.

Will be required by Rhapsode for navigational markers.

Implement style tree flattening utility.

This will be useful in Rhapsode for making sure voice synthesizers continue to
have full voice features information as the user jumps around the document.
And it will be useful for visual browsers in transitioning from layout to render.

Implement whitespace collapse, togglable via white-space: pre/normal;

Abstract Tree traversal (commited out-of-order).

Parse & prepare to handle white-space: pre;

Implement CSS3 counters.

Parse CSS counters.

Fix compilation of Assets StyleSheets.

Optimize: use HashMap.Lazy for cascade.

Provide utilities for rewriting CSS-referenced URLs.

Update metadata for new repo URL.

Release XML Conduit 1.1.0.0!

Moved to personal git homeserver, copy ISSUES over from NZOSS.

Integrate unstyled tests into XML Conduit Stylist.

Improve documentation, release version 1.2

Write reference documentation.

Request @import'd styles concurrently.