Java 6 compatability fix.

[djozis]

Commit to resolve Java 6 compatability issue: #44

[djozis]

Perhaps this should have checked against AutoCloseable now that I think about it. Perhaps it doesn't matter.

[oehme]

Thank you for looking into this! :)

There are other places in the intellij plugin where we use Java 7 API (Files.copy). Extra points if you could get rid of those.

Also to make sure we actually don't use any Java 7 APIs, it would make sense to adjust the travis configuration to build on Java 6.

[djozis]

Unfortunately I believe you are using other Gradle plugins which target Java 7 bytecode, so using Java 6 would fail.
I've never used IntelliJ, let alone the plugin, so that may be an issue for another time, or another contributor. I may still give it a go another day.
Is it ok to treat the IntelliJ Java 6 issue separately?

[Buggaboo]

tip: use jenv to switch quickly between jdk versions.

Usage: jenv shell 1.7 or 1.6 or 1.8...

[oehme]

Thank you for the fix, I will publish a patch release now.