Add utility function for comparing json_objects

Performance improvements

This provides more control over some detail aspects, many
of which are performance related.

It's needed to squash a "variable 'val' set but not used" warning.

Apply compile warning fix to master branch

- Tabs are easier to read for tired eyes and editor adjustable

add bsearch for arrays

Remove trailing whitespaces

improve doc for json_object_to_json_string()

Arrays can already be sorted with json_object_array_sort() which uses
qsort() of the standard C library. This adds a counterpart using the
bsearch() from C.

* CVE-2013-6371: hash collision denial of service
* CVE-2013-6370: buffer overflow if size_t is larger than int

Add json_object_free_userdata() and json_object_userdata_to_json_string() too.

Conflicts:
	json_util.c

* Return value of json_object_object_add() changed from void to int.
  Return value now indicates success or failure.

* Check whether allocations are successful.

* Do not exit program from within the library.

There are now three options: JSON_C_TO_STRING_SPACED, JSON_C_TO_STRING_PLAIN and JSON_C_TO_STRING_PRETTY.
This also add a json_object_to_file_ext() that takes the same flags.
Existing output of json_object_to_json_string() is unchanged, and uses JSON_C_TO_STRING_SPACED.
Thanks fo Grant Edwards for the initial patches.

New json_object_object_get_ex() method protects itself against null pointers
and invalid objects being passed in.

In building large systems, there are often clashes over the
preferred base type to use for bool/boolean. At least one
experience has been with a 3rd party proprietary library which
can not be changed. In that case, boolean was a synonym for
unsigned char and used widely in packed structures.

As part of this create a public json_config.h with a custom define to
decide whether to include inttypes.h to avoid conflicting with other
projects config.h header.

- uses libc's qsort to sort the arraylist
 - add test in test1.c

Patch from Rick Moran <https://github.com/DrHayt>


git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@74 327403b1-1117-474d-bef2-5cb71233fd97

git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@67 327403b1-1117-474d-bef2-5cb71233fd97