CS2113-AY1819S2-T09-1 / main / 676

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Logic: update `EditCommand` success and error messages (#139)

The error messages of `EditCommand` are very vague, and do not provide
much information to help users fix incorrect command usage.

Additionally, when editing a module, a user may not remember what module
was modified.

Furthermore, when users simply executes the `edit` command without any
parameters specified, they are greeted with "Invalid command format!".
This may cause users to feel more confused.

Let's update the success and error messages of `EditCommand` to address
the above problems by making the messages easy to understand and provide
relevant information to help them fix incorrect command usage. Also,
let's simply print `EditCommand#MESSAGE_USAGE` instead of
`CliSyntax#MESSAGE_INVALID_COMMAND_FORMAT`.

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