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Validators
==========
Validators allow you to validate or transform command arguments just before execution.
Knack supports both command-level and argument-level validators.
If a command has a command-level validator, then any argument-level validators that would ordinarily be applied are ignored.
i.e. A command can have at most command validator or many argument level validators.
**Command-level Validators**
Command-level validators can operate on any arguments on the command. This is useful when you need to control the validation sequence.
**Argument-level Validators**
Argument-level validators should only operate on a single argument.
The order argument-level validators are executed in is not guaranteed so don't use multiple argument-level validators that rely on the same arguments.
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