Updated Gradle Wrapper and configured Travis CI to check javadocs syntax on build

Author: smarek

.travis.yml

@@ -13,3 +13,4 @@ script:
   - echo "nexusUsername=dummy" >> library/gradle.properties
   - echo "nexusPassword=dummy" >> library/gradle.properties
   - ./gradlew clean assemble check
+  - ./gradlew :library:androidJavadocs

gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,6 @@
-#Sat May 09 18:54:15 CEST 2015
+#Sun Jul 12 18:36:13 CEST 2015
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.5-bin.zip