annotate IE pages for parsing address
add notebook for training IE address parser
fix some IE annotated data
add inside_bold_feature and also tokenize the comma on end of a string
update IE address parser nb
add  utils to do more cleanups in html

 e.g. replace the header to more general tag.
 the idea is to have make websturct works on a "generalized" html.
update the IE address parser nb
move the htmls cleanups to HTML feature generator's subclass
add general inside_tag feature function
convert the h2 to strong too
fix typo
split on comma after remove the comma in digits
fix tokenizer
fix GATE broken br elements

 checking by `grep -r -n --color -E '<br>.+</br>' *`
retrain the IE address parser and check in the models
more fixes on the broken annotated pages by GATE
Merge pull request #4 from scrapinghub/annotate-ie-address

Annotate ie address pages and add nb to train ie address parser