Remove deeplink.core.feature from master feature to allow build to continue.

Current state is causing a build fail with:
Processing inclusion from feature org.eclipse.e4.core.deeplink.feature:
Bundle org.eclipse.e4.core.deeplink.handler_4.6.0.v20101018-1500 failed to resolve.:
Package uses conflict: Require-Bundle: org.mortbay.jetty.server; bundle-version="0.0.0"