Set lenient to false for perun date formatter in beansUtils

 - because of bad coverting from string to timestamp we need more
   strict rules
 - set lenient to false means strict rules for conversion (formatter
   will not create date from wierd string)
Add behavior for concating special characters for xpath query

 - add private method convertToXpathSearchString which prepare query for
   xpath, this query need special behavior for single and double quotes
   using concat function
Merge pull request #579 from stavamichal/fixExtSourceXML

Add behavior for concating special characters for xpath query
Merge pull request #578 from stavamichal/setLenientForDateFormatter

Set lenient to false for perun date formatter in beansUtils