Add java builtin code style to editor plugin

Since I'm planning to submit a few more pull requests and my main projects all use a different coding style than the cucumber editor I thought it might be useful for other contributor's too to include the style within the project. The actual settings are just the 'java builtin' ones adjusted to always use tab's instead of mixed or only spaces that seems to match the existing code quite well.

Alternatively one could just export those settings and store them as an xml file in the project root and ask contributors to import them and set them on the project locally. That would avoid duplicating the settings across all plugins, but also means more manual work for contributors.

What do you think?