Get type item by extension, class, clsid or mime type.

@method getType
@param {String} value Value to get type item by.
@return {Object} Type item object or undefined.
function(value) {
			var i, values, typeItem;

			// Find type by checking the classes
			values = tinymce.explode(value, ' ');
			for (i = 0; i < values.length; i++) {
				typeItem = this.lookup[values[i]];

				if (typeItem)
					return typeItem;
			}
		}