SONAME bump

Update configuration for VS2010 and win64

Link against libm when needed

Enable silent build by default

In certain C libraries (e.g uClibc), isnan() and related functions are
implemented in libm, so json-c needs to link against it. This commit
therefore adds an AC_TRY_LINK() test to check whether a program
calling isnan() can be properly linked with no special flags. If not,
we assume linking against libm is needed.

The json-c.pc.in file is also adjusted so that in the case of static
linking against json-c, -lm is also used.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Revert some project settings to defaults

Define JSON_C_HAVE_INTTYPES_H in json_config.h.win32 only

Tightening the number parsing algorithm

Fix Win32 build problems

Introduce json_object_from_fd

add bsearch for arrays

Remove trailing whitespaces

Some badly formated "numbers" could get partly parsed,
resulting in truncated results instead of raising an
error.

Examples :
 '1.2.3'      -> (double)1.2
 '2015-01-15' -> (int)2015

This patch is not perfect (ex: input can still end with a 'E', which
is forbidden by json.org doc) but should avoid non-sensically
formated input.

Tests added.

improve doc for json_object_to_json_string()

Remove json_type enum trailing comma

Fix build using MinGW.

Removed duplicate check in random_seed test - bug #140

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.

MinGW requires wincrypt.h.
GCC does not support #pragma comment, which trips Werror.

The last json_tokener_errors change affects the binary package, we need a bump to solve the issue.

See [this bug of postgis.](https://bugzilla.redhat.com/show_bug.cgi?id=1123785)

Also refactor json_object_from_file to use json_object_from_fd
internally.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

Eliminate all uses of bits.h within the json-c code.

Thanks to Susant Sahani for pointing out some of these.

Update and rename README to README.md

Remove unused variable 'size'

- code blocks
 - slight text changes (rewording)
 - pretty printing

Markdownify + fix a few errors here and there