created widgetuser-edit.html, updated views.py and urls.py to account for new edit widgetuser function

fixed a typo in dashboard.html (get_absoluteurl -> get_absolute_url) and updated path of Add Widget User button, created widgetuser-add.html, updated urls.py and views.py to account for new add widgetuser function

created widgetuser-details.html, updated models.py, views.py, urls.py to account for new widgetuser details pages