added align to pixel

Align to Pixel.sketchplugin

@@ -0,0 +1,10 @@
+// snaps currently selected layer or group on whole pixel value (cmd shift ')
+
+var loop = [selection objectEnumerator]
+while (layer = [loop nextObject]) {
+  	roundedY = Math.round(layer.frame().y());
+	layer.frame().y = roundedY;
+
+	roundedX = Math.round(layer.frame().x());
+	layer.frame().x = roundedX;
+}

README.md

@@ -5,3 +5,4 @@ a box for random sketch plugins
 
 - **Toggle Specs** (cmd+L) toggles visibility of all of the layer groups in your document named "specs". Other than specs this could be useful with hidden guides.
 - **Select Parent Artboards** (cmd+shift+A) selects artboards that contain currently selected layers or groups. You can just draw a selection rectangle and hit the shortcut instead of selecting artboards one by one. Useful for moving many artboards around at once.
+- **Align to Pixel** (cmd+shift+’) aligns the selected layer or group to whole pixels by rounding the x and y values.