Added repositories section to streamline maven builds.

I've added a repository reference for clojars.org, as trying to do a `mvn clean package` results in a dependency resolution failure because storm can't be found:

    [ERROR] Failed to execute goal on project storm-jms: Could not resolve dependencies for project com.github.ptgoetz:storm-jms:jar:0.8.2-SNAPSHOT: Failure to find storm:storm:jar:0.8.1 in http://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced -> [Help 1]