Switch to customizable Gradle wrapper

Author: mttkay

rxjava-contrib/rxjava-android-samples/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Wed Apr 10 15:27:10 PDT 2013
+#Wed Mar 12 11:02:06 CET 2014
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-1.10-all.zip
+distributionUrl=http\://services.gradle.org/distributions/gradle-1.10-bin.zip