Global installation

Creates a global installation for Orion node.

To test:
```
cd modules/orionode
npm pack
sudo npm install -g orion-0.0.28.tgz
```

Can then run "orion" from any directory. Current functionality includes:
- ```orion```: launches orion on port 8081 using current working directory
- ```orion <workspaceDir>```: launches orion on port 8081 using workspaceDir
- ```orion -p <portno>```: launches orion on portno using cwd
- ```orion <workspaceDir> -p <portno>```: launches orion on portno using workspaceDir
- ```orion -w <workspaceDir> -p <portno>```: same as above, except order can be switched

Error thrown & exit if workspaceDir cannot be found/opened.