Add more source code extensions.

- C        .ii
- C++      .C, .cp, .cxx, .c++, .ii, .H, .hpp, .hxx, .h++, .tcc
- Fortran  .f, .for, .ftn
- Assembly .s, .S, .sx
- Obj-C    .M
Merge branch 'master' of git://github.com/EvanTeitelman/LS_COLORS into EvanTeitelman-master