code: static public File computeNunaliitDir(File installDir) {
  		while( null != installDir ){
  			// The root of the nunalii2 project contains "nunaliit2-couch-command",
  			// "nunaliit2-couch-sdk" and "nunaliit2-js"
  			boolean commandExists = (new File(installDir, "nunaliit2-couch-command")).exists();
  			boolean sdkExists = (new File(installDir, "nunaliit2-couch-sdk")).exists();
  			boolean jsExists = (new File(installDir, "nunaliit2-js")).exists();
  			
  			if( commandExists && sdkExists && jsExists ){
  				return installDir;
  			} else {
  				// Go to parent
  				installDir = installDir.getParentFile();
  			}
  		}
  
  		return null;
  	}
docs: Given an installation directory, find the root directory
  for the nunaliit2 project. This makes sense only in the
  context that the command-line tool is run from a development
  environment.
  @param installDir Computed install directory where command-line is run
  @return Root directory where nunaliit2 project is located, or null
  if not found.