Modified the build.gradle files to support building on JDK 7

even with a clean local repo.  Jcenter HTTPS no longer works from
JDK 7 so we have to fall back to the HTTP interface.

Author: pspeed42

build.gradle

@@ -42,7 +42,13 @@ compileJava {
 
 repositories {
     mavenLocal()
-    jcenter()
+
+    if( JavaVersion.current() == JavaVersion.VERSION_1_7 ) {
+        // Fallback for JDK 7 that can no longer connect to jcenter with https
+        maven { url "http://jcenter.bintray.com" }
+    } else {
+        jcenter()
+    }
 }
 
 // Make sure the build file declares what it actually imports