docs: fix plunker generation

Closes #398

Author: Matt Lewis

demos/plunker-assets/plunker-system-config.ejs

@@ -25,7 +25,7 @@ System.config({
     '@angular/animations/browser': 'npm:@angular/animations@<%- dependencyVersions.angular %>/bundles/animations-browser.umd.js',
     '@angular/animations': 'npm:@angular/animations@<%- dependencyVersions.angular %>/bundles/animations.umd.js',
 
-    'angular-calendar': 'npm:angular-calendar@<%- dependencyVersions.angularCalendar %>/dist/umd/angular-calendar.js',
+    'angular-calendar': 'npm:angular-calendar@<%- dependencyVersions.angularCalendar %>/umd/angular-calendar.js',
     'calendar-utils': 'npm:calendar-utils@<%- dependencyVersions.calendarUtils %>/dist/umd/calendar-utils.js',
     'angular-resizable-element': 'npm:angular-resizable-element@<%- dependencyVersions.angularResizableElement %>/dist/umd/angular-resizable-element.js',
     'angular-draggable-droppable': 'npm:angular-draggable-droppable@<%- dependencyVersions.angularDraggableDroppable %>/dist/umd/angular-draggable-droppable.js',