CHANGELOG
-Version 0.0.5
	Added methods for lifecontingencies objects
	improved vignettes (added JSS template).
	
-Version 0.0.4
	Improved documentation
	Added demographic functions
	Added US Social Security life tables.
	
-Version 0.0.3
	Improved documentation
	Add some multiple life functions
	fix a bug in method getOmega
	
-Version 0.0.2
	Specific interest rate can be given directly to the actuarial life contingencies functions that override lifetable one
	Update Axn for fractional ages
	pxn function now allows non integer x
	correct coerce methods to data.frame
	Some minor changes in the documentation

-Version 0.0.1
	First version of life contingencies