Force transitive Guava dep to version 18.0

Remove compile time warnings.

2015!

Bump test dependencies.

Fix some raw types.

Remove unused constructors in ConfigFile.

Add a test for ListenerInputStream.

Use Streams in TextFile.

Tidy downloader.

Delete some StreamUtils.

Hack FileUtils to provide copycontents methods.

Fix warning in tests.

Version util jar properly.

Update build scripts for artifactory.

Gradle version bump, now DNS works.

Tidy up gradle source sets.

This replaces the default source directories (src/main/java, etc)
with our own, instead of just appending ours to the list.

Add method to FileUtils to get a Path.

This maintains a FileSystem pointing at the jar the application is
running from, which can be used to get Paths for bundled resources.

Use J8 methods in TextFile.

Add a function based validator.

Remove deprecated method.

Tidying