styles are broken for NER docs

[kmike]

Weight tables don't fit the column at http://eli5.readthedocs.io/en/latest/tutorials/sklearn_crfsuite.html, and there is no scrolling - tables are just truncated.

I was able to fix it locally using custom CSS, but had to revert the fix (153ab4a) because on readthedocs.io original stylesheet was not loaded for some reason.

[lopuhin]

hm, RTD applies some hack to make tables look nice (places them in a div with overflow: auto), but it applies it only to the second table. Maaybe if we make all our explanations have one root div (maybe even without styles?), it will work better.

[lopuhin]

The same problem in the second table here: http://eli5.readthedocs.io/en/latest/tutorials/sklearn-text.html#debugging-hashingvectorizer - here it breaks with just one table

[kmike]

For me this css file fixed the issue locally (well, not perfectly); the problem is that I was not able to load it in readthedocs. Locally it worked fine, but on readthedocs.io it was the only theme css file loaded, so styles were broken.