implementation of custom apps module

Implement custom apps module, it will generate apps in menu bar .
Files used custom_template_for_app.html, custom_template_for_app.py, adminDashboard.html
Attributetype fields implement of basestring and boolean datatype
Working follow of custom app
1. to create new app:
 1.1. use designer module url /admin/designer/
 1.2. create systemtype with member of GAPPS
2. insert app_sets(i.e app sub-systemtype) to app :
2.1. to create app_set of app, edit collection_set of systemtype
2.2. use designer module to edit systemtype collection_set (url /admin/designer/GSystemType).
== it will view left side of app page
3. to insert fields to app_sets.
3.1 edit  attributetype_set of systemtype and insert attributetype which ever necessary 
4.  create new instance of app_set 
    - it will views all fields of app_set of attributetype_set