Awesome idea... do keep us posted on how it progresses
The easiest way is to use a voltage divider, as you can see in the following example for a Force Sensitive Resistor (FSR) sensor; the principle should be roughly the same:https://www.sparkfun.com/tutorials/269
Another relatively simple option would be to use a Wheatstone bridge setup:http://en.wikipedia.org/wiki/Wheatstone_bridge
If you have the chance to play around with a little bit more fancy electronics, the ideal would be to use an op-amp and have the output signal covering the dynamic range of the ADC.
Here are a few links to get you started:http://electrotap.com/2004/11/01/op-amps-part-1-scaling-sensor-voltages/http://www.instructables.com/answers/How-to-use-an-op-amp/
Needless to say that, although in most of the tutorials you'll find a reference to 5V operating voltage (Arduino UNO world), when designing your circuit and choosing your parts note that the operating voltage to consider is 3.3V, and that your sensor, in principle, should be directly powered from BITalino.
The BITalino Team