header files outside of the header_mappings_dir

[pedromcunha]

I'm trying to push this pod to a private pod repo but pod spec lint keeps failing with this error:

- ERROR | [iOS] header_mappings_dir: There are header files outside of the header_mappings_dir (Classes/src/bifs/quant.h, Classes/src/bifs/script.h, Classes/src/media_tools/mpeg2_ps.h, Classes/src/terminal/input_sensor.h, Classes/src/terminal/media_control.h, Classes/src/terminal/media_memory.h, Classes/src/utils/internal.h, Classes/src/utils/module_wrap.h, Classes/src/utils/zutil.h).

The pod spec file is exactly the same as what's in release version 0.2.2.