load events using threads
- ExecutorService
renamed CalendarService <-> CalendarServiceImpl
update method implemented
small refactoring CUD methods
set unique XML file names
added XML validator; refactored List to Map for recognized input events.
separated validate method + codeFormatting [Ctrl]+[Alt]+L
impl flat file search method:
means search files in ONE folder by pattern (*.xml) without recursion
refactor saveToXml and load methods
impl moving file method from working folder to deleted_xmldata folder
Merge pull request #15 from gnedov/Andr

[Andr] to preMaster