function isEmail( value ) {
	return isString( value ) && RE.test( value );
}
Tests if a value is a valid(ish) email address.

@param {*} value - value to test
@returns {boolean} boolean indicating whether a value is a valid(ish) email address

@example
var bool = isEmail( 'beep@boop.com' );
// returns true

@example
var bool = isEmail( 'beep' );
// returns false

@example
var bool = isEmail( 'beep.com' );
// returns false

@example
var bool = isEmail( null );
// returns false