Gradle官方文档：https://docs.gradle.org/current/userguide/installation.html#sec:download
使用 Gradle 命令行：http://wiki.jikexueyuan.com/project/gradle-2-user-guide/using-the-gradle-command-line.html
Maven和Gradle对比：
http://www.huangbowen.net/blog/2016/02/23/gradle-vs-maven/?utm_source=tuicool&utm_medium=referral
Gradle命令行黑魔法：http://www.huangbowen.net/blog/2016/02/23/gradle-vs-maven/?utm_source=tuicool&utm_medium=referral
maven仓库：https://repo1.maven.org/maven2/
