Unfinished bcsr design

[IsolatedMy]

The major revision:

• Add two new files: bcsr_matrix_view.hpp and bcsr_matrix_view_test.cpp
• Update generate_matrices.hpp file so that it can use generate_coo interface to generate matrix in bcsr format.
• Add generate_vector.hpp for future SpMV kernel example.
  Flaws:
• Current bcsr_matrix_view_test.cpp cannnot run normally. There exists segmentation fault when calling the constructor of Block structure;
• Include in some header files for debugging;
• Disable gtest for quick compilation and create new folder named 'cmytest';