fix shadow JAR distribution

Currently, dependencies are repackaged in the JAR, but the framework
classes aren't rewritten. This fixes the problem.

Author: tangiel

endpoints-framework-all/build.gradle

@@ -16,6 +16,7 @@ jar {
 def repackagedDir = 'endpoints.repackaged'
 
 shadowJar {
+  classifier = null
   relocate 'org.apache', "${repackagedDir}.org.apache"
   relocate 'org.yaml', "${repackagedDir}.org.yaml"
   relocate 'org.joda', "${repackagedDir}.org.joda"
@@ -31,6 +32,10 @@ shadowJar {
   }
 }
 
+artifacts {
+  archives shadowJar
+}
+
 dependencies {
   include project(':endpoints-framework')
   compile group: 'com.google.appengine', name: 'appengine-api-1.0-sdk', version: appengineVersion