Shipkit release model after 1.0

[mockitoguy]

How can we improve our productivity and development fun, while not preventing users on old versions of Gradle / Java?

After 1.0:

• we could start iterating on Shipkit 2.0 with Gradle 4 + Java 8.
• we could offer hotfixes to 1.x branch and releases from time to time if needed

This way we have cleaner code (Java8) and yet users on old versions can still use Shipkit 1.0

1.0 release is happening on October, by JavaOne conference.