Lower Ascii Characters don't get encoded by Entities.java
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                 Key: LANG-448
                 URL: https://issues.apache.org/jira/browse/LANG-448
             Project: Commons Lang
          Issue Type: Bug
    Affects Versions: 2.4
         Environment: N/A
            Reporter: Quintin Beukes


I have an XML files which sometimes contain control characters like 0x0c, or 
0x18. These aren't allowed to be directly in the file (the validator fails with 
invalid character), so they need to be escaped.

When using "StringEscapeUtils.escapeXml(String str)", which in turn uses 
"Entities.escape(Writer writer, String str)", these characters don't get 
escaped. Only characters above 0x7F get escaped.

I fixed this bug, and attached a patch.

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