Makefile generates 50 MB .dmg

Makefile generates 50 MB .dmg.

The increase in size is because of the .pdfs generated using wkhtmltopdf. Even using wkhtmltopdf version 0.9.9 results in these huge sizes. It may be because of the qt lib that is being used and/or compiler used (clang vs gcc), need to investigate more.

My system at home however, using the same makefile does not have this problem (it generates 19MB .dmg), so it might be a configuration difference.