v2.0.0

[nekuz0r-libWiringPi]: https://github.com/nekuz0r/wiringpi/

# v2.0.0
  * **Update:** libWiringPi to [custom][nekuz0r-libWiringPi] v2.20 `nekuz0r`
  * **Update:** split source code (based on libWiringPi hierarchy) `nekuz0r`
  * **Update:** better types check `nekuz0r`
  * **Update:** better allowed values check `nekuz0r`
  * **Update:** better error messages `nekuz0r`
  * **Update:** documentation `nekuz0r`
  * **Update:** constants are exported from c++ (ReadOnly | DontDelete) `nekuz0r`
  * **Update:** setup() is exported from c++ `nekuz0r`
    * NOTE: it no longer accepts empty parameter 'mode' (breaks backward compatibility)
  * **Update:** wiringPiSPIDataRW now takes a buffer as second parameter (no third anymore) `nekuz0r`
  * **Update:** piBoardId `nekuz0r`
  * **Remove:** backward compatibility constants `nekuz0r`
  * **Remove:** export of piComputeModuleRevisionNames `nekuz0r`
  * **Add:** export of PI_MODEL_* constants `nekuz0r`
  * **Add:** export of PI_VERSION_* constants `nekuz0r`
  * **Add:** export of PI_MAKER_* constants `nekuz0r`
  * **Add:** export of piMakerNames string table `nekuz0r`
  * **Add:** wiringPiISR `nekuz0r`
  * **Add:** pwmToneWrite `nekuz0r`
  * **Add:** CHANGELOG.md `nekuz0r`
  * **Add:** wiringPiI2C support `nekuz0r`
  * **Add:** wiring-pi install gpio utilty (required for interrupts) `nekuz0r`
  * **Add:** ds1302 support `nekuz0r`
  * **Add:** gertboard support `nekuz0r`
  * **Add:** lcd support `nekuz0r`
  * **Add:** lcd128x64 support `nekuz0r`
  * **Add:** maxdetect support `nekuz0r`
  * **Add:** piFace support `nekuz0r`
  * **Add:** piGlow support `nekuz0r`
  * **Add:** piNes support `nekuz0r`
  * **Add:** tcs34725 support `nekuz0r`
  * **Fictitious:** this release eats Pi(e)s :)