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Version 0.9 (August 2013)
  (Changes from version 0.8)
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Bug Fixes:
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+ Fixed incorrect mask in member function PWM_Board::setDutyCycle in pca9685_pwm.cc
  Said error caused led on/off times to be incorrectly set causing catastrophic damage to
  servo motors when using certain duty cycle values.
+ Fixed incorrect register read in member function PWM_Board::sleep in pca9685_pwm.cc
  that resulted in incorrect restoration of Mode1 register after sleep.
+ Added missing destructor for the PWM_Board class. The destructor is necessary since
  terminating the master program or even shutting down the R-Pi does not turn off the PWM
  channels on the PCA9685.

Enhancements:
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+ Added a new member function PWM_Board::getFreq in pca9685_pwm.cc to enable us to
  determine the frequency that the board is (or, at least thinks that it is) operating at.
+ Added a new member function PWM_Board::readRegister in pca9685_pwm.cc to allow
  a simple way to read a single register on the pca9685.
+ Added a new member function PWM_Board::fullOn in pca9685_pwm.cc to allow us to set a
  single channel (or all channels) to logic 1 without any transitions at the end of pulse
  periods. This also allows us to use a channel as a (non real time) chip select for
  other peripherals, thus freeing up a GPIO pin on the host microcontroller.
+ Added a new member function PWM_Board::fullOff in pca9685_pwm.cc to allow us to set a
  single channel (or all channels) to logic 0 without any transitions at the end of pulse
  periods. This also allows us to use a channel as a (non real time) chip select for
  other peripherals, thus freeing up a GPIO pin on the host microcontroller.
+ Added a new member function PWM_Board::wakeUp in pca9685_pwm.cc to wake up the
  pca9685 from sleep in just a few I2C cycles, with all PWM channels restored to their
  pre-sleep state.
+ Changed member function PWM_Board::sleep in pca9685_pwm.cc so that all PWM channels
  are not shut down explicitly prior to sleeping. Otherwise, we cannot restore all PWM
  channels to their pre-sleep state without explicitly reloading all the LEDn_ON and
  LEDn_OFF registers.
+ Added a new member function PWM_Board::setPulseWidth in pca9685_pwm.cc to allow
  more accurate setting of pulse widths for use with servo motors.
+ Implemented missing error checks in member function pca9685_pwm.cc to ensure that
  read/write failures to the PWM board result in an appropriate error return code
  (I2C_TRANSACTION_FAILED).
+ Changed member function PWM_Board::softReset in pca9685_pwm.cc so that executing this
  function now leaves the pca9685 with clean, default values in its Mode1, Mode2,
  Prescale, LEDn_On_H, LEDn_On_L, LEDn_Off_H and LEDn_Off_L registers.
+ Cleaned up code and naming conventions for functions and variables.

Miscellaneous:
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+ Renamed the project to more accurately reflect the hardware chip (PCA9685) that it is
  written for. Although the reference implementation is Adfruit's PCA9685 breakout board,
  these routines should work for *any* PCA9685-based board.

TO DO:
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* Allow I2C device 's path and minor device number to be use-specifiable in member functions
  PWM_Board::initialize and PWM_Board::hardReset.