Support gradle a project manager

[m0smith]

In addition to maven, gradle should be supported.

[QiBaobin]

Yes please. Thank your for doing this.

[codygman]

This will help for android development since many developers use gradle.

[m0smith]

Some resource that will be helpful:

• https://gradle.org/docs/current/javadoc/org/gradle/tooling/GradleConnector.html
• https://gradle.org/docs/current/userguide/embedding.html
• http://gradle.org/docs/current/userguide/groovy_plugin.html

[m0smith]

Created a sample session using the gradle tooling api: https://gist.github.com/m0smith/e2f8a6565f24600fc204