CS2113-AY1819S2-T09-1 / main / 666

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travis-ci

Logic: update `DeleteCommand` success and error messages (#142)

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

Additionally, when users simply executes the `delete` 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 `DeleteCommand` 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 `DeleteCommand#MESSAGE_USAGE` instead of
`CliSyntax#MESSAGE_INVALID_COMMAND_FORMAT`.

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