Fix problem with gpg-plugin on Cygwin
Fix problem with gpg-plugin on Cygwin

When signing the projects' artifacts using the maven-gpg-plugin
a "no tty found" error occurs. This only happens with version 1.6
of the plugin. Version 1.4 works as expected.

culturegraph/metafacture-fluently,culturegraph/metafacture-fluently