master: Added implementation of leastSquare Boolean SDP/l1 penalty.

    - Least squares with Boolean SDP formulation algorthm can be foud in
        leastSquare_BSDP.m
      It's not working properly now and needs further debugging.
    - Least squares with l1 penalty can be found in
        leastSquare_L1.m
      Now it's working.
    - To run tests on them, just open matlab and run
        test_LSBSDP
      and
        test_LSL1

On branch master
Changes to be committed:

      new file:   leastSquare_BSDP.m
      new file:   leastSquare_L1.m
      new file:   test_LSBSDP.m
      new file:   test_LSL1.m