Software I2C / TWI library for Arduino allows any two pins to be SDA & SCL
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2010-2012, Tod E. Kurt,
2014, by Testato: update library and examples for follow Wire’s API of Arduino IDE 1.x

SoftI2CMaster is an Arduino library that implements
a simple "bit-bang" software-only I2C (aka "TWI") Master.

This lets you use any two Arduino pins to be the SDA & SCL 
pins needed to communicate with I2C devices like BlinkMs.

SoftI2CMaster was originally in the BlinkMSoftI2CDemo example