DualWord-index 0.4.1
	- bug fixes.
	
DualWord-index 0.4.0
	- progress bar, non-blocking loading.
	
DualWord-index 0.3.2
	- bug fixes.
	
DualWord-index 0.3.1
	- bug fixes.
	
DualWord-index 0.3.0
	- interface changes and bug fixes.
	
DualWord-index 0.2.0
	- search using default Xapian query parser.
