Rename tokenizerspec.{h,cpp}

* Just so clang_complete doesn't freak out over -std=c++11.

Signed-off-by: Max Reitz <xanclic@niwohlos.org>
Clean up generated files on make clean

+ If make clean is called, all generated source files should be cleaned
  up as well

Signed-off-by: Max Reitz <xanclic@niwohlos.org>