make spec / implementation / faq separate pages.  goal is to make the site less
mouseover-ish.  for a specification, it seems to me one should easily be able to
download or cut and paste it, so that is sort of the goal.

note the leaf pages don't have headers or anything.  not as formal but in the spirit
of something like:

  https://www.ietf.org/rfc/rfc4627.txt

if there is a consensus to put them in, go ahead though.

as text was in tooltips i had to pick some new ordering.  some is in the bottom in "comments".
in general i have attempted not to edit or change text as this is a standard -- although i have
removed a redundant word here or there.
comments->notes
twos complement
implementations: update C library link to libbson.

Libbson and mongo-c-driver were split into two separate libraries. Let's
just go ahead and link to libbson directly.

Signed-off-by: Christian Hergert <christian.hergert@mongodb.com>
Merge pull request #25 from chergert/master

implementations: update C library link to libbson.
fixing link to .NET driver bson implementation
publication merge