0.9.0 released

TTMath 0.9.0 released, main features are:
- support for wide characters (wchar_t, std::wstring)
- full multithread support
- x86_64 asm code for Microsoft Visual compiler (64 bit)

Now TTMath can be compiled for 6 different platforms:
asm_vc_32 - with asm code designed for MS VC (32 bits)
asm_gcc_32 - with asm code designed for GCC (32 bits)
asm_vc_64 - with asm for VC (64 bit)
asm_gcc_64 - with asm for GCC (64 bit)
no_asm_32 - pure C++ version (32 bit) - without any asm code
no_asm_64 - pure C++ version (64 bit) - without any asm code

The two latter can be run on every little-endian machine.