wro4j-core/src/main/java/ro/isdc/wro/util/StringUtils.java
private static String collectionToDelimitedString(final Collection<String> coll,
      final String delim) {
    return collectionToDelimitedString(coll, delim, EMPTY, EMPTY);
  }
private static String collectionToDelimitedString(final Collection<String> coll,
      final String delim) {
    return collectionToDelimitedString(coll, delim, EMPTY, EMPTY);
  }
Convenience method to return a Collection as a delimited (e.g. CSV) String.
E.g. useful for <code>toString()</code> implementations.

@param coll
the Collection to display
@param delim
the delimiter to use (probably a ",")
@return the delimited String