Working on #72

can find Vars whose type should be implicity required by an @param, but
don't get the @param {TYPE}  type

using GetImplicitDependenciesNodeTraversal, which is meant to parallel GetDependenciesNodeTraversal

copied NodeUtil and ReferenceCollectingCallback from com.google.javascript.jscomp to net.vtst.ow.closure.compiler.deps, to gather references.

added junit to buildpath: test doesn't pass