ENH add show_dimensions display config
see http://stackoverflow.com/questions/21293983/disabling-dataframe-dimensions-printing

If you've already done this @DSM054 apologies, just saw your comment... :s

Next time I'll call dibs.  In any case, I found an error in the test suite while I was doing it, so it wasn't all a waste.

What do you think about the reference in `_repr_html_`?  I switched it too in mine.
 anyone want to provide a doc on 'how to configure your display', showing what/how the options interact? (for the main docs)
 @dsm054 _repr_html is a good spot... Added!

@jreback definitely needed.
 looks good to me, @y-p ?
 I was thinking, would it be an option to only have it displayed if your dataframe is truncated? Or does that make it to complicated? (so you would have three options: always, if truncated, never)
 @jreback sure, ok.
 Should update the FAQ section on customizing display with this.
http://pandas.pydata.org/pandas-docs/dev/faq.html#how-do-i-control-the-way-my-dataframe-is-displayed
 @hayd I would move that current section to the main docs (and update it), then provide a link back into the FAQ
(or link back to the main docs ok too......)

we have this 'orphaned' section here: http://pandas.pydata.org/pandas-docs/dev/basics.html#console-output-formatting which should either include the display formatting (more prominently), or added to the FAQ
 @hayd can you make those updates to the FAQ (and can fix the full docs at a later time)....though if you could move/link console-formatting would be great
 @hayd , we're ramping up to release 0.13.1, are you on this or would you like me to take care of it?
 Added to FAQ. If it looks ok, will squish.

@y-p Happy if you can fix the console-formatting docs or we can have as sep issue.. It needs some love.
 Cleaned up and merged as 9ab2385.
 #3104 is still open for the other stuff.
 @jorisvandenbossche , on/off seems good enough.
