json-cpp Code

Added further floating point tests.

Switched away from sprintf, which is prone to buffer overflows.

Most reasonable platforms have this function. If you're here because
this broke the build for you, consider adding an ifdef for your platform
and using sprintf there (but not on other platforms).

- CMake: added option to turn fail compilation if warning occurs, and warning level 4 with MSVC.
- Fixed some warnings

- disabled warning 4786 for VS6 caused by STL (identifier was truncated to '255' characters in the debug information)
- added batchbuild config for XP VM

Added simple batch build script for CMake.

Added missing source file to CMakeLists.txt.

Fixed continuous integration matrix for debug/release build. Made static debug build verbose.

Added continuous integration matrix for debug/release build. Made static debug build verbose.

Added continuous integration matrix for shared/static library (specified through environment variables).