init() now throw Errors when sensitive option are invalid
init() now throw Errors when sensitive option are invalid

Also create some temporary variables in some function to allow variable name mangling when minifying

CapeSepias/cal-heatmap,kamisama/cal-heatmap,kamisama/cal-heatmap,aslubsky/cal-heatmap,DreamlineStudios/cal-heatmap,DreamlineStudios/cal-heatmap,kbullaughey/cal-heatmap,wa0x6e/cal-heatmap,CapeSepias/cal-heatmap,devcollectief/cal-heatmap,aslubsky/cal-heatmap,merbla/cal-heatmap,merbla/cal-heatmap,devcollectief/cal-heatmap,kbullaughey/cal-heatmap