[CONFIGURATION-516] PropertiesConfiguration no longer escapes double quotes on saving.

The escaping logic now uses a CharSequenceTranslator which is a slightly
modified version of the ESCAPE_JAVA translator from Commons Lang 3. It
does not escape double quotes.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1464966 13f79535-47bb-0310-9956-ffa450edef68