JCenter 介绍
JCenter 是一个用来查找和分享常用 Apache Maven 包，可通过 Maven、Gradle、Ivy 和 SBT 等工具使用。
For the most comprehensive collection of artifacts, point your Maven at:
http://jcenter.bintray.com Want to distribute your own packages through
JCenter? You can link your package by clicking the “Include My Package”
button. And if you’re into legacy, you can even synchronize your packages
directly to Maven Central.