Adding reference to aJson library that's needed

Was getting compile errors without it:

```
../.ino.cpp:16:19: fatal error: aJSON.h: No such file or directory
compilation terminated.
make: *** [.ino.cpp.o] Error 1
```
Merge pull request #6 from kigster/patch-1

Adding reference to aJson library that's needed
Got the project to compile in Eclipse. 

Here is the build command:

"<private_hardware_dir>/hardware/teensy/tools/mac/arm-none-eabi/bin/arm-none-eabi-g++" 
  -c -g -Os -ffunction-sections -fdata-sections -nostdlib -fno-rtti -fno-exceptions 
  -mcpu=cortex-m4 -DF_CPU=96000000 -DUSB_SERIAL -DLAYOUT_US_ENGLISH -MMD 
  -DARDUINO=158  -mthumb  -D__MK20DX256__  -felide-constructors 
  -std=gnu++0x -DTEENSYDUINO=120   
  -I"/Users/kig/arduino/hardware/teensy/all/cores/teensy3" 
  -I"/Users/kig/arduino/hardware/teensy/all/libraries/DS1307RTC" 
  -I"/Users/kig/arduino/hardware/teensy/all/libraries/FastLED" 
  -I"/Users/kig/arduino/hardware/teensy/all/libraries/IRremote" 
  -I"/Users/kig/arduino/hardware/teensy/all/libraries/SD" 
  -I"/Users/kig/arduino/hardware/teensy/all/libraries/SD/utility" 
  -I"/Users/kig/arduino/hardware/teensy/all/libraries/SPI" 
  -I"/Users/kig/arduino/hardware/teensy/all/libraries/Time" 
  -I"/Users/kig/arduino/hardware/teensy/all/libraries/Wire" 
  -I"/Users/kig/arduino/hardware/teensy/all/libraries/Wire/utility" 
  -I"/Users/kig/arduino/libraries/aJson" 
  -I"/Users/kig/arduino/libraries/aJson/utility" 
  -I"/Users/kig/arduino/libraries/SmartMatrix_32x32" 
  -MMD -MP -MF".ino.cpp.d" -MT".ino.cpp.d" -D__IN_ECLIPSE__=1 
  -x c++ ".ino.cpp"  -o  ".ino.cpp.o"   -Wall