Do not display a warning on excluded directories

[highsource]

When certain directories are excluded in plugin configuration in pom.xml, the plugin outputs warnings:

[INFO] using jshint version 2.4.1
[WARNING] Excluding D:\Projekte\app\trunk\impl\app-war\src\main\webapp\app\js\lib\OpenLayers-2.13.1\lib\deprecated.js
[WARNING] Excluding D:\Projekte\app\trunk\impl\app-war\src\main\webapp\app\js\lib\OpenLayers-2.13.1\lib\Firebug\firebug.js
[WARNING] Excluding D:\Projekte\app\trunk\impl\app-war\src\main\webapp\app\js\lib\OpenLayers-2.13.1\lib\Firebug\firebugx.js

This does not hurt but feels completely unnecessary. I'm excluding a large third-party library and get a couple of hundreds of these messages.

[yas99en]

I think so.

[bvarner]

These should probably be debug.