Update Start of line and End of line

[mrsherlock88]

Hi @jerosoler ,

I just update the calculator of position output and input point. Please take a look at this, one problem is I don't check is multiple output/input points case but I think it will be alright.

I also add my custom CSS to change the point's position to top/bottom/left/right. These CSS can use outside of your CSS but I thinks it should be defined in a formal way, via code or included in json.

/* Make inputs to the top */
.drawflow .parent-node .custom-node-1 .inputs {
  position: absolute;
  top: -10px;
  padding-left: 50%;
}
/* Make outputs to the bottom */
.drawflow .parent-node .custom-node-2 .outputs {
  position: absolute;
  bottom: -10px;
  padding-left: 50%;
}
/* Make inputs to the right */
.drawflow .parent-node .custom-node-3 .inputs {
  position: absolute;
  right: 0px;
}
/* Make outputs to the left */
.drawflow .parent-node .custom-node-4 .outputs {
  position: absolute;
  left: 0px;
}

Add reference to the issue we've discussed: #20