Add networking.

README.md

 * [Brick\Math](https://github.com/brick/math) - A library providing large number support: `BigInteger`, `BigDecimal` and `BigRational`.
 * [ByteUnits](https://github.com/gabrielelana/byte-units) - A library to parse, format and convert byte units in binary and metric systems.
 * [DecimalObject](https://github.com/spryker/decimal-object) - A value object to handle decimals/floats easily and more precisely.
+* [IP](https://github.com/darsyn/ip) - An immutable value object for working with IPv4 and IPv6 addresses.
 * [LibPhoneNumber for PHP](https://github.com/giggsey/libphonenumber-for-php) - A PHP implementation of Google's phone number handling library.
 * [PHP Conversion](https://github.com/Crisu83/php-conversion) - Another library for converting between units of measure.
 * [PHP Units of Measure](https://github.com/triplepoint/php-units-of-measure) - A library for converting between units of measure.
-* [MathPHP](https://github.com/markrogoyski/math-php) - A math library for PHP.
+* [MathPHP](https://github.com/markrogoyski/math-php) - A math library for PHP. 
 
 ### Filtering and Validation
 *Libraries for filtering and validating data.*
 * [PHP PassBook](https://github.com/eymengunay/php-passbook) - A PHP library for iOS PassBook.
 * [PHP-ML](https://github.com/jorgecasas/php-ml) - A library for Machine Learning in PHP.
 * [PHPCR](https://github.com/phpcr/phpcr) - A PHP port of the Java Content Repository (JCR).
-* [PHPStack](http://dunkels.com/adam/phpstack/) - A TCP/IP stack proof of concept written in PHP.
 * [print_o](https://github.com/koriym/print_o) - An object graph visualizer.
 * [Procrastinator](https://github.com/lstrojny/Procrastinator) - A library for running time consuming tasks.
 * [Prooph Service Bus](https://github.com/prooph/service-bus) - Lightweight message bus supporting CQRS and Micro Services