Added datasheets of parts we're considering using.

ATtiny45 - µController
LM3940 - Low volage dropout 3.3V regulator
PSMN017-30PL - N-channel MOSFET (we might end up using the provided
transistors instead, if the order gets too expensive)
TLC555 - Low operating voltage 555 timer for generating the 38kHz
carrier pulse for the IR LED.
TSSP4038 - 38kHz IR detector, peak wavelength at 950nm
TSUS5202 - IR LED, optimal I = 100mA