Upgrade to gradle 4.0

- updated common functions into closures for exporting

gradle/functions.gradle

@@ -14,10 +14,7 @@
  *  limitations under the License.
  */
 
-gradle.allprojects {
+def getCheckedOutGitCommitHash() {
-
-    // https://gist.github.com/JonasGroeger/7620911
-    ext.getCheckedOutGitCommitHash = {
     def gitFolder = "$projectDir/.git/"
     def takeFromHash = 6
 
@@ -33,9 +30,9 @@ gradle.allprojects {
 
     def refHead = new File(gitFolder + head[1].trim())
     refHead.text.trim().take takeFromHash
-    }
+}
 
-    ext.getCheckedOutBranch = {
+def getCheckedOutBranch() {
     def gitFolder = "$projectDir/.git/"
 
     def head
@@ -45,5 +42,9 @@ gradle.allprojects {
     } catch(Exception e) {
         return "SNAPSHOT";
     }
-    }
+}
+
+ext {
+    getCheckedOutGitCommitHash = this.&getCheckedOutGitCommitHash
+    getCheckedOutBranch = this.&getCheckedOutBranch
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Mon Apr 24 12:27:08 SGT 2017
+#Mon Jul 03 07:09:45 EDT 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.0-bin.zip

gradlew

@@ -33,11 +33,11 @@ DEFAULT_JVM_OPTS=""
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
 
-warn ( ) {
+warn () {
     echo "$*"
 }
 
-die ( ) {
+die () {
     echo
     echo "$*"
     echo
@@ -155,7 +155,7 @@ if $cygwin ; then
 fi
 
 # Escape application args
-save ( ) {
+save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }