Move sizeup recipe/attribute to sprout-osx-apps

@hiremaga I wanted to get this recipe moved out of pivotal_workstation before I submit a PR to add the 'addloginitem'

I have moved the recipe and attributes, created a shim and then updated an include_recipe to use the new sprout-osx-settings::enabled_assistive_devices instead of making a circular dependency back to pivotal_workstation for that recipe. 

Thanks!