Make urn and zdbID searchable via "id" resp. "name" parameter

* add tests

See lobid/lodmill#234 and #62.
Add resolver to plugins.sbt as a workaround

See http://stackoverflow.com/questions/26205825/typesafe-activator-unresolved-dependency-com-typesafe-sbtsbt-native-packager.
Correct test and adapt text-index-config
Merge pull request #65 from hbz/issue-66-and-lodmill-234-urnAndzdbidSearchable

Make urn and zdbID searchable via "id" resp. "name" parameter