title: Change Gradle mavenCentral URL to My repo
body: <p>While working with Gradle in my country, download jars from maven central is a very timely-costed work.<br>
  <strong>I wanna change the mavenCentral to maven-nexus:</strong><br>
  which means whenever I use mavenCentral it <strong>always</strong> points to <strong><a href="http://maven.oschina.net/content/groups/public/" rel="noreferrer">oschina</a></strong></p>
  
  <p>------edit------<br>
  <strong>I have lots of projects with mavenCentral, so I do not want change each file.</strong></p>
  
  <p>Now in new scripts I use maven{ url ...}
  Any easy way??  </p>
  
  <p>Any one can hlep?<br>
  Thanks!</p>