repositories { jcenter() mavenCentral() }
http://stackoverflow.com/questions/27056733/change-gradle-mavencentral-url-to-my-repo
https://docs.gradle.org/current/dsl/org.gradle.api.artifacts.dsl.RepositoryHandler.html
jcenter – The URL used to access this repository is “https://jcenter.bintray.com/”
mavenCentral – https://repo1.maven.org/maven2/
repositories { maven {url "http://repo1.maven.org/maven2"} }