0.8.5

• Sparse matrix-vector product for OpenCL vector types:

    vex::SpMat <cl_double2> A;
    vex::vector<cl_double2> x, y;
    y = A * x;

• Added raw_pointer() function. See 'Raw pointers' section in README.
• Fixed compilation for 32bit Visual Studio (thanks to @d-meiser for
  reporting!).
• Other bug fixes.