Simplify fetch of Geode artifacts. Reset geode version re: GEODE-8016

Authored-by: Robert Houghton <rhoughton@pivotal.io>
(cherry picked from commit a7895d505fc4f309934eeb7e35b112e0a0852c50)
diff --git a/build.gradle b/build.gradle
index d4b2302..1f2cfce 100644
--- a/build.gradle
+++ b/build.gradle
@@ -23,14 +23,19 @@
 
 allprojects {
     repositories {
-        if (geodeRepositoryUrl != "") {
-            maven {
-                url geodeRepositoryUrl
-            }
+        mavenCentral() {
+          content {
+            excludeGroup 'org.apache.geode'
+          }
         }
-        mavenCentral()
-        maven {
-            url 'https://storage.googleapis.com/maven.apachegeode-ci.info/snapshots'
+
+        if (!gradle.usingGeodeCompositeBuild) {
+          maven {
+            url project.findProperty('geodeRepositoryUrl') ?: 'https://maven.apachegeode-ci.info/snapshots'
+            content {
+              includeGroup 'org.apache.geode'
+            }
+          }
         }
     }
 }
diff --git a/gradle.properties b/gradle.properties
index ee9169f..7dba56c 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -14,8 +14,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-version = 1.13.0-SNAPSHOT
-geodeVersion = 1.13.0-SNAPSHOT
+version = 1.13.0-build.0
+geodeVersion = 1.13.+
 
 # release properties, set these on the command line to validate against
 # a release candidate