Fix Gradle tests

Author: tyronen

imagepipeline/build.gradle

@@ -20,7 +20,9 @@ dependencies {
     testCompile "com.google.guava:guava:${GUAVA_VERSION}"
     testCompile "junit:junit:${JUNIT_VERSION}"
     testCompile "org.mockito:mockito-core:${MOCKITO_CORE_VERSION}"
-    testCompile "org.powermock:powermock-api-mockito:${POWERMOCK_VERSION}"
+    testCompile("org.powermock:powermock-api-mockito:${POWERMOCK_VERSION}") {
+        exclude group: 'org.mockito', module: 'mockito-all'
+    }
     testCompile "org.powermock:powermock-module-junit4-rule:${POWERMOCK_VERSION}"
     testCompile "org.powermock:powermock-classloading-xstream:${POWERMOCK_VERSION}"
     testCompile("org.robolectric:robolectric:${ROBOLECTRIC_VERSION}") {