Allowing options and output to stdout

- Also defaulting dest to a file, so that it is not required (e.g. when directing output to stdout)

Conflicts:
	src/main/groovy/com/eriwen/gradle/js/JsPlugin.groovy
update version to 1.4.0
Remove old comment
Minor code tweaks
Examples and docs for additional JSHint options
Update to latest jshint