v0.1.0 changes

[ace411]

• Instate operation error checks in php_mrloop_writev_cb and php_mrloop_readv_cb callbacks
• Register global TCP connection data buffer size
• Add connection data size and connection count parameters to tcpServer() function
• Duplicate client connection file descriptor in php_mrloop_tcp_server_recv callback
• Add vector count and offset parameters to addReadStream() function
• Add vector count parameter to addWriteStream() function
• Change DEFAULT_STREAM_BUFF_LEN and DEFAULT_CONN_BUFF_LEN values
• Define DEFAULT_VECTOR_COUNT, DEFAULT_READV_OFFSET and PHP_MRLOOP_MAX_TCP_CONNECTIONS