Upgrade to Java 8

[mpkorstanje]

Java 8 will allow:

• Repeatable annotations: Provide multiple annotations support for Cucumber-JVM #1341, Allow multiple step patterns on the same method #957, Defining several steps for the same function #895
• Clean up our internal code base by allowing us to use lambdas and streams
• Allow us to keep up with our support libraries (Mockito, JUnit) and all the goodness this brings

Android supports practically all of Java 8 as of a API Level 24 so this should no longer block us.

[lock]

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