Implement JSHint suggestions

src/js/DefaultRules.js

src/js/PenthouseNaming.js

src/js/SetBellySize.js

src/js/accordianJS.js

src/js/assayJS.js

src/js/assignJS.js

src/js/birthJS.js

src/js/colorModeJS.js

src/js/datatypeCleanupJS.js

src/js/economyJS.js

src/js/eventSelectionJS.js

src/js/extendedFamilyModeJS.js

src/js/familyTreeJS.js

src/js/food.js

src/js/generateGenetics.js

src/js/generateNewSlaveJS.js

src/js/heroCreator.js

src/js/pregJS.js

src/js/relationshipChecks.js

src/js/removeActiveSlave.js