added a few more parse rules for sax
additional tests and made the nesting depth infinite or as much as memory will hold
Merge pull request #51 from rubymaniac/html_tests

Added some html specific tests
a bit more re-org and fix to text not termination error
added symbolize option to sax parser
added symbolize option to sax parser
updated readme
changed behavior so that empty html tags are auto closed
Added some additional tests that check for ill cases in HTML documents. Fixed a typo in an Unexpected Character error.