Add Netstring support

Netstring is a simple protocol for messaging using arbitrary byte data.

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Add Netstring text support

Make the common case of messaging using arbitrary character strings
easier.

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Use Netstring in NASDAQ OMX SoupTCP 1.0 test

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Merge pull request #149 from jvirtanen/features/netstring

Add Netstring support