Finished Error handling across the API

Signed-off-by: Ryan Fletcher <ryan.fletcher@codepassion.ca>

lib/Service/StackService.php

@@ -89,6 +89,7 @@ class StackService {
 		}
 	}
 
+	//TODO: Write this function so we can look up one stack id.
 	public function find($stackId) {
 		throw new \Exception('Not yet implemented');
 	}