Modified the build.gradle files to support building on JDK 7 even with a clean local repo.  Jcenter HTTPS no longer works from JDK 7 so we have to fall back to the HTTP interface.
Modified the build.gradle files to support building on JDK 7
even with a clean local repo.  Jcenter HTTPS no longer works from
JDK 7 so we have to fall back to the HTTP interface.

Simsilica/SimEthereal