Add invisible text removal, passes legacy tests no new tests
Add test fixture for invisible text in html
Trim invisible_text fixture to minimum
Add failing test for invisible text
Proper failing test, original accidently used global messytables
Pass invisible_text test, fixes #25
Move invisible_text test into test_read.py
Merge pull request #26 from scraperwiki/invisible-text

Ignore invisible text in HTML - improved compared to text_content()