Merge pull request #46 from marketboomer/ratjens

define a preview icon
Merge pull request #47 from marketboomer/ratjens

rationalise gem dependencies *AFFECTS ALL ENGINES*
Domain Constraint
Merge branch 'current' of https://github.com/marketboomer/nunchaku into iteration-danny
Merge pull request #48 from marketboomer/iteration-danny

Domain Control
Merge pull request #49 from marketboomer/ratjens

generalise current_Session partial in nunchaku