RELEASE-1.0.0a2

Lots of reorganization and initial test suite.

* Renamed all "Socket\*Transmitter" classes to "Tcp\*".
* Added test suite with nearly complete code coverage. Remaining coverage is due to forward compatibility issues.
* Added FilterCollection, in turn allowing for the same filter to be applied more than once.
* Added NetworkStream, and made Tcp* classes inherit from it. This new class contains a new method called shutdown().
* IPv6 addresses must now be written literally, without the surrounding "[" and "]".
* TcpServerConnection can now accept IPv6 connections.
* Merged sendStream() into send().
* Added $offset and $length to send().
* Removed redundant error variables in TcpServerConnection.
* Removed the TcpServerConnection::isServer() function (can't tell apart server and client).