add some get-set method to XSLT class:

 ->getPath()
 ->setPath()
 ->getParameters()
 ->setParameters()
 ->mergeParameters()
 ->getClean()
 ->setClean()
create two event: 'xslt-view-engine:beforeRender' and 'xslt-view-engine:afterRender'
add new option: 'defaultParameters'
XSLT->getClean() and XSLT->setClean() methods are declared to deprecated and add new methods: ->setMustClean(), ->getMustClean()
add new method: XSLT->removeParameters()
add new methods: XSLT->getInstanceId() and XSLT::getInstance()
some changes in XSLT->render() method
move the test files in "test/test_1" directory and change
FIX: ensure the event firing in XSLT->render() method
UPDATE: add new methods: XSLT->getXMLPath(); XSLT->setXMLPath(); XSLT->setXMLDom() and modifiy XSLT->render()
add new test directory: 'test_2'
small fix in XSLT->setOptions()