Gradle Refresh

- move common functions to functions.gradle
 - use dependency aliases whenever possible
 - update to gradle 2.1
 - cleanup build.gradle files with proper spacing
 - remove duplicated blocks
 - compile incrementally (java)

Gradle Refresh v2

 - alphabetical order dependencies
 - added jdk8 to build tests
 - moved script to file for travis

Gradle Refresh v2a

 - fix travis
 - remove pointless logging

jdk8 isn't ready for travis

gradle/functions.gradle

@@ -0,0 +1,49 @@
+/**
+ *  Copyright 2011 Ryszard Wiśniewski <brut.alll@gmail.com>
+ *
+ *  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.
+ */
+
+gradle.allprojects {
+
+    // https://gist.github.com/JonasGroeger/7620911
+    ext.getCheckedOutGitCommitHash = {
+        def gitFolder = "$projectDir/.git/"
+        def takeFromHash = 6
+
+        def head
+        try {
+            head = new File(gitFolder + "HEAD").text.split(":")
+        } catch(Exception e) {
+            return null;
+        }
+
+        def isCommit = head.length == 1
+        if(isCommit) return head[0].trim().take(takeFromHash)
+
+        def refHead = new File(gitFolder + head[1].trim())
+        refHead.text.trim().take takeFromHash
+    }
+
+    ext.getCheckedOutBranch = {
+        def gitFolder = "$projectDir/.git/"
+
+        def head
+        try {
+            head = new File(gitFolder + "HEAD").text.split("/")
+            return head[2].trim();
+        } catch(Exception e) {
+            return "SNAPSHOT";
+        }
+    }
+}