fix #4
Merge branch 'fix_issue_4' into develop
make unittests silent
simplify simulation program interface
add print function of demographic model
Merge branch 'print_dm' into develop
update howtos
Merge branch 'develop' into dm_sumstats

Conflicts:
	.gitignore
	DESCRIPTION
	inst/unitTests/runit.dm-ms.R
	inst/unitTests/runit.dm.R
	jaatha.Rproj