Issue #197: Add GPG signatures to release artifacts Done.
Issue #197: Add GPG signatures to release artifacts
Done.

DeanWay/phenotips,JKereliuk/phenotips,alexhenrie/phenotips,itaiGershtansky/phenotips,phenotips/phenotips,danielpgross/phenotips,tmarathe/phenotips,danielpgross/phenotips,tmarathe/phenotips,tmarathe/phenotips,teyden/phenotips,teyden/phenotips,alexhenrie/phenotips,mjshepherd/phenotips,phenotips/phenotips,mjshepherd/phenotips,itaiGershtansky/phenotips,teyden/phenotips,phenotips/phenotips,DeanWay/phenotips,JKereliuk/phenotips,teyden/phenotips,DeanWay/phenotips,alexhenrie/phenotips,veronikaslc/phenotips,phenotips/phenotips,mjshepherd/phenotips,itaiGershtansky/phenotips,veronikaslc/phenotips,phenotips/phenotips,JKereliuk/phenotips,veronikaslc/phenotips,teyden/phenotips,danielpgross/phenotips