Put FastCGI code into server framework

Put FastCGI code into server framework

Implement basic SensorHandler function.
Can now get data from (simulated still) sensor displayed in web browser.

SensorHandler deals with argument checking, identifies the sensor,
sends the JSON, etc, calls Sensor_Query appropriately.

Sensor_Query actually fills a buffer with requested number of data points.

Example of use:
http://server.address/api/sensor?id=0

Use run.sh to start fastcgi server under valgrind.