add Merge and UnMerge functions to api builder

cell/apiBuilder.js

@@ -558,6 +558,30 @@
 		this.range.setNumFormat(value);
 	};
 
+	/**
+	 * Creates a merged cell from the specified Range.
+	 * @memberof ApiRange
+	 * @param {bool} across
+	 */
+	ApiRange.prototype.Merge = function (across) {
+		if (across) {
+			var ws = this.range.worksheet;
+			for (var r = this.range.r1; r <= this.range.r2; ++r) {
+				ws.getRange3(r, this.range.c1, r, this.range.c2).merge(null);
+			}
+		} else {
+			this.range.merge(null);
+		}
+	};
+
+	/**
+	 * Separates a merged area into individual cells.
+	 * @memberof ApiRange
+	 */
+	ApiRange.prototype.UnMerge = function () {
+		this.range.unmerge();
+	};
+
 
 
 
@@ -793,6 +817,8 @@
 	ApiRange.prototype["SetStrikeout"] = ApiRange.prototype.SetStrikeout;
 	ApiRange.prototype["SetFillColor"] = ApiRange.prototype.SetFillColor;
 	ApiRange.prototype["SetNumberFormat"] = ApiRange.prototype.SetNumberFormat;
+	ApiRange.prototype["Merge"] = ApiRange.prototype.Merge;
+	ApiRange.prototype["UnMerge"] = ApiRange.prototype.UnMerge;
 
 
 	ApiDrawing.prototype["GetClassType"]             =  ApiDrawing.prototype.GetClassType;