Lua : Fix array removal

We're adding values to the "0" index of an array, even though this isn't
a default by lua standards.  One place we need to work this situation is
in the "remove" method.  This will need to do an extra check if we're
removing from 0.

std/lua/_std/Array.hx

@@ -81,7 +81,16 @@ class Array<T> {
 		for (i in 0...this.length){
 			var a = this[i];
 			if (a == x){
-				lua.TableTools.remove(cast this, i+1);
+				if (i == 0){
+					if (length == 1){
+						this[0] = null;
+					} else {
+						this[0] = this[1];
+						lua.TableTools.remove(cast this, 1);
+					}
+				} else {
+					lua.TableTools.remove(cast this, i);
+				}
 				this.length-=1;
 				return true;
 			}