resource skinning

# Resources for standard skinning classes

## Description

When standard skinning classes or background images are inaccessible `"Resource not registered : org.richfaces.renderkit.html.images.InputBackgroundImage"` (another name is possible) exception appears in server log.

## Links

- Jira

- RichFaces Forum

## How to reproduce

The described above problem usually occurs after server restart when user refreshes the page

## Causes

The problem is caused when resources for standard skinning classes are not available to be registered during RichFaces library build

## Workarounds

Switch off standard skinning classes by setting initial parameter in web.xml:

    ...
    <context-param>
        <param-name>org.richfaces.CONTROL_SKINNING_CLASSES</param-name>
        <param-value>disable</param-value>
    </context-param>
    ...

Add META-INF/resources-config.xml to the application classpath.