[maven-release-plugin] prepare for next development iteration
Fixed maven-gpg version

Change-Id: I07892d02b175ac4056e60870bb4f09b7483c2b78
Export explicitly 'clients' namespace so it can be used in browser

Change-Id: I3380894f9b1d90de37fa2679ceb7112a5897ffa1
Package version updated to release version
[maven-release-plugin] prepare release kws-rpc-builder-4.3.15