Add support for 'is.email'

[joeltankam]

Checks if the given value is an email.

is.email('[email protected]'); // true
is.email('[email protected]'); // true
is.email('[email protected]'); // true
is.email('[email protected]'); // false

Checkout full email description on wikipedia.

Update README.md: under is > RegExp

[oaguinaga]

I would like to help with this

[joeltankam]

You're welcome

[joeltankam]

RFC5322 official standard