When resizing an element along just the y-axis, the element's x-coord should not snap to the grid automatically

[nathanielw]

Currently, if you have an object positioned so that it is not aligned perfectly with the grid (e.g. positioned using the arrow keys or as a result of snapping to something else not on the grid), resizing with the vertical handles will also resize the shape horizontally, snapping it to the nearest grid line.

This is definitely unexpected behaviour, since the user is explicitly trying to resize in a single direction.

From a brief play around, it seems this is caused by the GeometryEditor.handleMouseMove function calling Util.gridNormalize(...) on the newX (and newX2) variables without actually checking if the resize should be altering the width at all. (this is all in app/editor/geometryEditor.js, around line 400)

This should be a simple fix, so I'll try to get a PR up when I have time in the next few days.