Adding "Edit" button to entries

Added HTML for Edit button. Also started to add JS functions for entry editing, though they are not connected to the button yet.
Adding AJAX request to update_entry JS function

Changed 'edit' crud action and 'edit_entry' function name to use 'update' instead, staying consistent with existing update functionality.
Add functionality for "Edit" button

- Edit Entry form appears in place of entry text and is populated by existing entry.
- Added class to entry form textarea (will eventually replace id)
- Added entry content data to update_entry JS function (still not complete)
Converting spaces to tabs
Converting entry form IDs to classes
Changing jQuery tabs back to IDs to restore functionality
Moved edit entry form modifications into separate function
Changing click handler for form submit button

Submit button was not working on form elements created after page load (i.e. Edit Entry forms). Changed handler to accommodate this.
Changing JS update_entry to use correct textarea for submission
Enabling display of edited entries

Changed update_entry functionality to properly display the updated entry text. Since the entire entry is replaced by the form when Edit is clicked, the entire entry HTML needed to be replaced on submit.