added an edit action and an update methods to update existing records
form partial file to remove duplication for form views in edit and new files
view for editting records
modified styling for the table
moved form code to _form partial file
added link to edit post
added a destroy method to delete record from database
added a link to delete record
files created by generating the Comment model
modified migration file
associate post model with comments
added route for comments
files created by generating the Comments controller
added create and destroy action to add and delete comments respectively
modified code comments
added association and depaendant option to comments
partial file to list all comments
partial file for new comment form
added sections for listing comments and a form for new comments