deal with anchors and index.html "page aliasing: proprerly

* so now http://a.com/index.html and http://a.com/ are understood equivalents
* as are http://a.com/x.html#blog and http://a.com/x.html (etc.)
* this meant a little more bookkeeping in docrawler, but not horrible
* stripAnchorFromURL because stripURL because it now handles anchor and path suffix stripping
* and url tests were written to support this

docs/TODO.md

@@ -2,11 +2,6 @@
 
 ## Bugs
 
-* deal with anchor issue (repeatedly crawling index.html#about, index.html#contact, etc.)
-  * should only crawl these pages once
-  * but should be included in the links part
-* be smart about index.html?
-
 ## Cleanup
 
 * helper function to do the whole crawl process