Adding nuget.exe to .gitignore
Reduce the confusion caused by this lingering around during a nuget rev.
Rename pinFunction to _PinFunction
This follows the internal function naming convention instead of the standard wiring naming convention
Merge pull request #18 from zfields/gitIgnore

Adding nuget.exe to .gitignore
Merge pull request #21 from zfields/renameInternalFunction

Rename pinFunction to _PinFunction
Added a non-modifiable return value to allow operator[] to be used on const objects.
Also added WString.h to Arduino.h to make String appear as a first class type.