Add eth2 reference tests

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "eth-reference-tests/src/test/resources/eth2.0-tests"]
 	path = eth-reference-tests/src/test/resources/eth2.0-tests
 	url = https://github.com/ethereum/eth2.0-tests.git
+[submodule "eth2-reference-tests/src/test/resources"]
+	path = eth2-reference-tests/src/test/resources
+	url = https://github.com/ethereum/eth2.0-spec-tests.git

eth2-reference-tests/build.gradle

@@ -0,0 +1,25 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE
+ * file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file
+ * to You 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.
+ */
+jar { enabled = false }
+
+dependencies {
+
+    testCompile project(':junit')
+    testCompile 'com.fasterxml.jackson.core:jackson-databind'
+    testCompile 'com.fasterxml.jackson.dataformat:jackson-dataformat-yaml'
+    testCompile 'org.bouncycastle:bcprov-jdk15on'
+    testCompile 'org.junit.jupiter:junit-jupiter-api'
+    testCompile 'org.junit.jupiter:junit-jupiter-params'
+
+    testRuntime 'org.junit.jupiter:junit-jupiter-engine'
+}

settings.gradle

@@ -20,6 +20,7 @@ include 'devp2p'
 include 'dist'
 include 'dns-discovery'
 include 'eth'
+include 'eth2-reference-tests'
 include 'eth-reference-tests'
 include 'eth-repository'
 include 'ethstats'