Add Dataset URI builder

This task is to add a URIBuilder class to allow programatic construction of Dataset/View URIs from DatasetRepositoryURIs, Dataset names, and Entity attribute equality constraints.

The URIBuilder can be leveraged by a Kite URI EL function in Oozie that might look something like this:

  <dataset name="Person" frequency="${coord:days(1)}" initial-instance="2014-04-24T00:00Z" timezone="UTC">
    <uri-template>${kite:datasetUri(repositoryUri, "person", "version", "${YEAR}_${MONTH}_${DAY}")
    </uri-template>
  </dataset>

The URIBuilder is also useful in other places such as tests where the repositoryUri (or repository) is treated as a parameter.