Optimize StringEscapeUtils.unescapeXml(String)
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                 Key: LANG-287
                 URL: http://issues.apache.org/jira/browse/LANG-287
             Project: Commons Lang
          Issue Type: Improvement
    Affects Versions: 2.2
            Reporter: Stepan Koltsov
            Priority: Minor


StringEscapeUtils.unescapeXml(String) (and other unescaes) works too slowly if 
String has nothing to unescape, that is very common situation.

To make unescape faster, following check should be added to be start of 
Entities.unescape(str)

if (str.indexOf('&') < 0)
    return str;

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