Add IntelliJ Idea Code Formatting settings for Java Flank

[doodla]

This will allow anybody who uses IntelliJ to keep consistent formatting in their PRs.

This is basically Google's style guide taken from here.

Having this PR in will help me ( and others who use IntelliJ ) to avoid weird diffs in future PRs.

[CLAassistant]

All committers have signed the CLA.

[doodla]

It looks like there is already some sort of formatting in place. If you can let me know the specifics, I'll modify my PR to match.

[bootstraponline]

We're relying on spotless to enforce Java code style. That's why the Travis CI build is failing.

spotlessJava

Any changes to the style should be made in the spotless configuration. Spotless also has an auto correct mode.

https://github.com/diffplug/spotless

[bootstraponline]

Let's figure out how to use spotless instead of adding a dependency on an IDE for formatting. :)

[doodla]

@bootstraponline The java formatter plugin was not supported by the latest version of IntelliJ Idea. Google provides their codeStyle settings for IntelliJ Idea though. I've modified my PR to apply Google's code style directly. It does not conflict with spotless in my testing, which would have been... odd.

Also, there seems to be an issue open on spotless to support IntelliJ directly, which has a Jetbrains issue open. diffplug/spotless#200

I think this passes muster.

[bootstraponline]

Awesome. Nice work.