Adding EoL marker for html files

Adding the missing EoL marker for all modal dialog template html files
Changing Add-URL API to PUT method

* Modifying app.py with PUT method for /post
* Modifying controller.js to fire PUT method to add new post
* Adding config "apiEndpoint" to controller with the api endpoint
* ^ Used by all the http reuqests
Adding remove Post functionality

* Adding a method to remove post from DB
* Adding a method to handle DELETE request to delete post
* Removing unwanted commented code
Modifying Web UI & controller

* Modifyng remove-group-modal template
* Renamed remove-group-modal to remove-modal
* Now remove-modal is used to handle removal of both group & posts
* Handling events & models to signify what kind of object is being
    removed - Group or Post?
Web UI - generalizing the handling of remove item

* Adding onRemoveItem in controller to handle genric removal of item
* onRemoveItem will intern call respective removal methods
* Handling generic removeal function as click handler for remove
Maintianing uniform handling of cookies

Using the validate_cookie method in every call to check the user info
Merge branch 'user-cookie-detection-uniformity' into dev