test window
Add window for fast iteration on neighborhoods.
Add tuple utility to implement parallel_for constructs.
test window
Remove a bad header in tests.
Add a sanbox test file
Add a fill algorithm
Add the new tests in CMakelists
Add boxNd_row_iterator
Add imageNd_row_iterator
Add new headers in vpp.hh
Fix imageNd with border, add offset_of in imageNd
Switch to c++1y
Tests imageNd with border.
Fix imageNd_iterator test for the new api
More benchmark for parallel for
Add row_iterator to boxNd
Parallel for update :
  - new syntax taking advantage of c++1y features :

  vpp::pixel_wise(img1, img2) << [&] (auto& in, auto& out)
  {
    int sum = 0;
    for (auto& n : nbh(in)) sum += n;
    out = sum / 3;
  };

  - row_wise and col_wise equivalents.
More tests for parallel_for.