Enable flow documentation in external build

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=241934689

java/google/registry/documentation/generate_javadoc.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+# Copyright 2017 The Nomulus Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# Generate javadoc for the project
+
+if (( $# != 3 )); then
+  echo "Usage: $0 JAVADOC ZIP OUT" 1>&2
+  exit 1
+fi
+
+JAVADOC_BINARY="$1"
+ZIP_BINARY="$2"
+TARGETFILE="$3"
+TMPDIR="$(mktemp -d "${TMPDIR:-/tmp}/generate_javadoc.XXXXXXXX")"
+PWDDIR="$(pwd)"
+
+"${JAVADOC_BINARY}" -d "${TMPDIR}" \
+  $(find java -name \*.java) \
+  -tag error:t:'EPP Errors' \
+  -subpackages google.registry \
+  -exclude google.registry.dns:google.registry.proxy:google.registry.monitoring.blackbox
+cd "${TMPDIR}"
+"${PWDDIR}/${ZIP_BINARY}" -rXoq "${PWDDIR}/${TARGETFILE}" .
+cd -
+rm -rf "${TMPDIR}"