Incorporate ErrorProne into the maven build

[tianchen92]

FEATURE REQUEST

1. Using https://github.com/google/error-prone seems like it would be a good idea to automatically catch more errors.

This could catch more potential exceptions (example see https://errorprone.info/)

I would like to work on this issue.

[duhenglucky]

@tianchen92 It looks like a very interesting job :), could you give a more detailed design, or list some benefits about this integration?

[tianchen92]

Sorry for the delay, the integration is very simple, just config in the root pom and it will work when run "mvn clean install", it will fail when it catch potential problems match error-prone bug patterns, such as this one: http://errorprone.info/bugpattern/DeadException

In this way, with little change, we could introduce error-prone and it will improve our code quality in future I think.