added exception for invalid/no api key

lib/sightstone.rb

@@ -42,6 +42,9 @@ end
 # Base class for exceptions raised by the gem
 class SightstoneApiException < Exception; end
 
+# Raised if no or an invalid api key was passed to the api
+class InvalidApiKeyException < SightstoneApiException; end
+
 # Raised if the given developer cannot be found (api returns http error code 404)
 class SummonerNotFoundException < SightstoneApiException; end
 

lib/sightstone/modules/sightstone_base_module.rb

@@ -28,9 +28,11 @@ class SightstoneBaseModule
       raise Sightstone::SightstoneConnectionException
     elsif response_code == 429
       raise Sightstone::RateLimitExceededException
+    elsif response_code == 401
+	raise Sightstone::InvalidApiKeyException
     else
       raise Sightstone::SightstoneApiException 'Unknown error occured'
     end
   end
   
-end
+end