1. Start to work on Linux;
2. Add method getLocalTZOffset
	Linux BSD version complete
	Windows version incomplete
1. bool is base type of C++, so no typedef.
2. getLocalTZOffset windows version complete.
3. Add some definition of functions(todo).
	XTime: getTZOffsetByZonename
	XString: isAllDigit, isAllLetter, isIpAddress