v0.5.2

• undefined x,y position messes up grid (#1017).
• changed code to 2 spaces.
• fix minHeight during onStartMoving() (#999).
• TypeScript definition file now included - no need to include @types/gridstack, easier to update (#1036).
• new addWidget(el, options) to pass object so you don't have to spell 10 params. (#907).