Allow injecting versions and shas for scala extra jars (#631)
Allow injecting versions and shas for scala extra jars (#631)

* Allow overriding scala_extra_jar_shas

* Clean up and rename scala_extra_jar_shas to scala_extra_jars

bazelbuild/rules_scala,smparkes/rules_scala,smparkes/rules_scala,bazelbuild/rules_scala,bazelbuild/rules_scala,ianoc/rules_scala,smparkes/rules_scala,ianoc/rules_scala,ianoc/rules_scala