value to test
boolean indicating whether a value is a valid(ish) email address
var bool = isEmail( 'beep@boop.com' );
// returns true
var bool = isEmail( 'beep' );
// returns false
var bool = isEmail( 'beep.com' );
// returns false
var bool = isEmail( null );
// returns false
Tests if a value is a valid(ish) email address.