added a images_to_alt option to discard images and keep only their alt
Merge pull request #49 from oasiswork/jd-image_to_alt

added a images_to_alt option to discard images and keep only their alt

Thanks @JocelynDelalande
pep8
Merge branch 'master' into jd-protect-links

Conflicts:
	test/test_html2text.py