Merge pull request #64 from wmde/docs

Add some documentation lines

Author: mariushoch

src/Map.js

@@ -66,6 +66,8 @@ $.extend( SELF.prototype, {
 	/**
 	 * @param {string} key
 	 * @param {Object} item
+	 * @throws {Error} if the item is not an instance of the constructor registered with the Map
+	 *         object.
 	 * @return {boolean}
 	 */
 	hasItem: function( key, item ) {
@@ -77,6 +79,8 @@ $.extend( SELF.prototype, {
 	 * @param {string} key
 	 * @param {Object} item
 	 *
+	 * @throws {Error} if the item is not an instance of the constructor registered with the Map
+	 *         object.
 	 * @throws {Error} if an item for the specified key is registered already.
 	 */
 	addItem: function( key, item ) {
@@ -144,6 +148,8 @@ $.extend( SELF.prototype, {
 	/**
 	 * @param {string} key
 	 * @param {Object} item
+	 * @throws {Error} if the item is not an instance of the constructor registered with the Map
+	 *         object.
 	 */
 	setItem: function( key, item ) {
 		this._assertIsItem( item );

src/Statement.js

@@ -21,6 +21,9 @@ var SELF = wb.datamodel.Statement = function WbDataModelStatement( claim, refere
 	this.setRank( rank === undefined ? wb.datamodel.Statement.RANK.NORMAL : rank );
 };
 
+/**
+ * @class wikibase.datamodel.Statement
+ */
 $.extend( SELF.prototype, {
 	/**
 	 * @property {wikibase.datamodel.Claim}