Add a windows scripting host configure file.
Simply run cscript configure.js from the win32 directory to generate
the files needed to create the modbus DLL.
Fixed style issues.
Cleanup on configure.js (w/o any tests...)
Avoid C99 declaration in win32 section code (closes #92)

Thanks to oldfaber and endrelovas.
Add documentation for modbus_mask_write_register (closes #91)
Add Martijn de Gouw name to documentation