#16 added the needed components to change the appearance
 #16 load the same images as in the DownloadDialog
 #16 set the proper text for the hyperlink

In RepresentationRenderer, the text of the data access hyperlink needs
to be changed according of the function-tag of the Representation.
Therefore a function-bundle was created which contains the diferent
strings.
 #16 configured the second hyperlink in the RepresentationRenderer

The Add-to-Cismap hyperlinks is visible if the protocol of the
Representation is WMS or WFS. On click on the hyperlink the
contentlocation is added as capability to the capability widget of the
cismap.
 #16 if no ContentType image available, use extension

In ImageGetterUtils.getImageForContentType() the parameter extension was
added. If this parameter is not null and no image for the ContentType
was found, then a image for that extension is searched.

Needed to add commons.io for a comfort method
(FilenameUtils.getExtension()).
 #16 add comment
Merge branch 'feature/16-proper-implementation-Data-Access-panel' into dev