Building on linux

Had some issues with building this today:
- needed to manually point at the `/usr/local/lib/nuitrack/` libs
- even after built I get the following error
```
Usage: nuitrack_console_sample [path/to/nuitrack.config]
WARNING: Can not load library module: /usr/etc/nuitrack/middleware/libNuitrackModule.so
ERROR: Empty factory for DepthProvider
Can not initialize Nuitrack (ExceptionType: 2)
```