security/igtf-certificates @1.52: update to 1.54 and some other changes

Further changes:
- add license, long_description, livecheck, documentation; 
- some editing;

The port should be okay for submission to Macports. I would propose to submit it as it is and ask for further feedback. It is quite independent of the Globus TK stack. 

If you are okay with this I could proceed, just let me know.