DOC: document read_html and to_html
FYI after #3693 u won't need to import read_html explicitly anymore
 ok i will remove
 i changed a few things around in `html.py` nothing major, but now `read_html` attempts to infer row and columns index types if they are not `MultiIndex`es. rls notes for this? it doesn't try to infer dates
 you might need to rebase this after #3693
 done.
 Where you show reading with an attribute, I think you are missing something?

It looks the same as the prvious example

http://pandas.pydata.org/pandas-docs/dev/io.html#io-html
 where  r u looking i don't see the attrs anywhere...also a problem
 oh i c
 it's missing -u prob copied the prior example
 man the io docs take 4ever 2 compile
 there's probably a very tight correlation btwn amt docs amt of tests and amt of code all pairwise
 true!

for 0.11 I had to keep rereading the docs
For all of the indexing chnges
as no tests for language!
 pr is up
