call [self positionAndUpdatePopUpView] in setup

Sets popupView frame ready for display.
Added property 'alwaysShowPopupView'

When set to ‘Yes’ the popupView displays at 0 and 100 percent and
doesn’t automatically hide.
Added switch to show hide popupView
Made capitalization consistent throughout files

Use ‘popUp’ throughout, not ‘popup’
Merge branch 'show_always'