Moved header files to src/include

Also removed cblas.h and lapack.h headers (should be provided by the libraries
installed on the system).
Removed old Makefiles and duplicated headers
Fix conditionals in src/graphics/graphics.cpp

Replaced binary operator (&) with boolean operator (&&)
Corrects mkl includes in mat_spec.cpp solver_full.cpp
Adds .travis.yml to enable travis CI