[kxml_compiler]Add support for xs:short type

[martonmiklos]

Just like the title says.

[dfaure]

Where exactly? It's already supported in kwsdl at least.

./schema/typestable.cpp:46: mBasicTypes["short"] = XSDType::SHORT;
./kwsdl/typemap.cpp:61: addBuiltinType("short", "short");
./kwsdl/converter_utils.cpp:55: { "short", "short", "QString::number( *value )", "str.toShort()" },

[martonmiklos]

To the kxml_compiler for generating C++ code from XSD/XML. I have came across an XSD which contained an xs:short item and it generated string member for the element. I have already fixed it, just I need to extend the tests to cover this type too.