Adds a pretty_printing function for JSON objects.
Adds contrib/liboauth.
Fixes a typo and removes verbosity in Bison.

Now the twitter.y does not output inline things;
we have already set a pretty_print function which
should do the job in the end.

Besides, removes the inline declaration for pretty_print.
And we add it to the pretty_print2.
Adds a particularly not useful comment.
Adds support for building with the GNU Autotools.
Adds pretty_print to the header file.