Validator-collection

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* 37: Added regex matching to variable name validation. Still checks compilation
but first must pass regex validation.

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* 34: Fixed case sensitivity bugs in URL validator.

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* 32: Removed a `print` statement left over from debugging.

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* 28 and 29: Fixed an error where special URLs (`localhost`) and special IPs (e.g.
`10.1.1.1`) failed when used with an explicit port or path.

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* 25: Fixed an error where an underscore in a host name was not being properly
recognized (h/t mastak) when parsing URLs and domain names.
* 23: Fixed an error where URL / domain validators and checkers were (incorrectly)
failing on valid special names (e.g. `localhost`, etc.) and special IPs (e.g. `10.1.1.1`).
* 24: Fixed bug where checkers returned false-negatives when the underlying validator
raised a `SyntaxError`.

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* 21: Fixed `validators.datetime()` handling of timezone offsets to conform to ISO-8601.

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