w32 and w64 release of InterfacingFlowstar

The 32-bit DLL was compiled using 32-bit MinGW and G++ 4.8.1 with the following static libs:

• gmp 5.1.3
• mpfr 3.1.2
• gsl 1.9
• glpk 4.52

The 64-bit DLL was compiled using 64-bit MingW and G++ 4.7.0 (experimental) with the same static libs.