* Fixes #264, #220, #210, #206 
* Clarified requirements for deadline and phone number parameters 
* Clarified how duplicates are checked for
* Cosmetic changes made to make UG look neater
* Check UG format standardization (e.g. standardize `Syntax:`)
* Check that things written in UG matches with the app functions

…ests

* commit '016445fefd92118ca5ffac32f7d93d15098ec6a4':
  Checkstyle

Add Sort command activity diagram

Switch ordering of list and sort commands

#128
* Separated out Edit command activity diagram into 2 separate diagrams
for better visibility
* Add activity diagram and explanation for sort command
* Edited User stories and DG
* Minor cosmetic changes

#127

…ve section

Fixes #289 

Reason for bug:
* Order has OrderName and MenuItem data fields
* But when storing order as JsonAdaptedOrder, we only keep track of the
MenuItem
* In the previous implementation of edit order command, only the
OrderName field is updated and MenuItem is not (After parsing the edit
order command input, in `EditOrderCommand::createEditedItem()`, the
edited Order object is created with the updated OrderName only, which
calls the Order constructor that only initialize the order name
correctly and initialize MenuItem as `INVALID`)

Changes made:
* Make `EditOrderCommand::createEditedItem()`, create the edited Order
object with the updated MenuItem instead of OrderName

… and maintain code quality (#287)

Add test for the following menu command parser:
- AddMenuItemCommandParser
- EditMenuItemCommandParser
- DeleteMenuItemCommandParser
- FindMenuItemCommandParser

Add test for DeleteOrderCommandParser

Add Javadocs

Maintain Codequality by removing functions that are no longer used.The
functions remove are:
- getTargetTab under ObservableTabIndex class
- getTagName from JsonAdaptedTag

# Conflicts:
#	docs/DeveloperGuide.md

Add documentation of Shutdown and Dealing with missing/corrupted data

* Correct AddOrderCommand MESSAGE_USAGE (added space between
`q/ORDER_QUANTITYd/DEADLINE`)
* Minor modifications to UG
* Revert some changes made after v1.4 (e.g. changes made to edit item
error messages) as they are considered enhancements and not bug fixes.

…n one word for customer name command

…to branch-admin