Re-enables javadoc and source for zipkin-ui (static asset) publishing
Re-enables javadoc and source for zipkin-ui (static asset) publishing

Eventhough bintray (ex jfrog) allows publications that don't include
source and javadoc jars, Maven Central does not. This means that we
need source and javadoc for jars that don't even include java!

This reverts commit b4b441bb1e6843dc34a1bfdf124207c4d701e2ff.
See http://central.sonatype.org/pages/requirements.html#supply-javadoc-and-sources

adriancole/zipkin,twitter/zipkin,openzipkin/zipkin,adriancole/zipkin,openzipkin/zipkin,abesto/zipkin,twitter/zipkin,adriancole/zipkin,abesto/zipkin,openzipkin/zipkin,openzipkin/zipkin,openzipkin/zipkin,twitter/zipkin,adriancole/zipkin,twitter/zipkin,abesto/zipkin,abesto/zipkin