Ir esp8266 lib update and code impacts (#235)

* integrate new IRremoteESP8266 lib 2.4.2 and add new protocols

IR_RC6
IR_MITSUBISHI
IR_GICABLE
IR_MITSUBISHI2
IR_LASERTAG
IR_CARRIER_AC
IR_MIDEA
IR_NIKAI
IR_SHERWOOD
IR_DENON
IR_AIWA_RC_T501
IR_JVC

lib/IRremoteESP8266/.github/Contributors.md

@@ -0,0 +1,16 @@
+## Contributors of this project
+### Main contributors & maintainers
+- [Mark Szabo](https://github.com/markszabo/) : Initial IR sending on ESP8266
+- [Sébastien Warin](https://github.com/sebastienwarin/) (http://sebastien.warin.fr) : Initial IR receiving on ESP8266
+- [David Conran](https://github.com/crankyoldgit/)
+- [Roi Dayan](https://github.com/roidayan/)
+- [Marcos de Alcântara Marinho](https://github.com/marcosamarinho/)
+- [Massimiliano Pinto](https://github.com/pintomax/)
+- [Darsh Patel](https://github.com/darshkpatel/)
+- [Jonny Graham](https://github.com/jonnygraham/)
+- [Stu Fisher](https://github.com/stufisher/)
+- [Jorge Cisneros](https://github.com/jorgecis/)
+
+All contributors can be found on the [contributors site](https://github.com/markszabo/IRremoteESP8266/graphs/contributors). 
+
+### Contributors of the [original project](https://github.com/z3t0/Arduino-IRremote) can be found on the [original project's contributors page](https://github.com/z3t0/Arduino-IRremote/blob/master/Contributors.md)