Fixes #126.

Only run the imprecision part if json_int_t is long long, otherwise
the imprecision cannot be tested against json_int_t.

Also, convert the double value to json_int_t before checking the
imprecision, because otherwise the json_int_t is converted to double
and the imprecision happens in the "wrong direction".

Implemented a decode option to only decode numbers to reals

Adjust CMakeLists.txt and .def: add _d postfix onto jansson_d.lib/dll

Added missing return valua check in test

Had to remove the "LIBRARY" line from jansson.def, which was optional,
and was overriding CMake's desire for a specific name.

Fixes #119.

Added json_array_foreach(), parallelling json_object_foreach()

Cmake pkgconfig

Use the same jansson.pc.in file as the ./configure script does to generate the jansson.pc file for pkg-config. Also make an install rule for this.

The cmake sphinx find script version parsing assumes a format of 1.2.3, but sphinx version can be 1.2b3 as well, so parse those correctly as well.

Signed-off-by: Andrei Epure <epure.andrei@gmail.com>

In the "/* perform the same update again */" area the error
message should be "unable to update an non-empty object"
instead of "unable to update an empty object".

Signed-off-by: Andrei Epure <epure.andrei@gmail.com>

Additional CMake documentation + Fpic cmake support

- Also added better FindSphinx support so that we can detect the version and not  have a fatal error if it's too old.
- Added support for building latex documentation with -DBUILD_LATEX. Off by default.
- Added suppor for building man pages with -DBUILD_MAN. On by default (unless sphins is too old to support it).

So that we can link the library statically to shared libraries.

Next time, remember to check with -Werror first...

Fixes redefined warnings ("_GNU_SOURCE")