Update examples to use new module names

examples/shell/shell/Main.hs

@@ -2,7 +2,7 @@
 -- a simple shell for loading plugins and evaluating their functions
 -- 
 
-import Plugins
+import System.Plugins
 import API
 
 import Data.Either

examples/shell/simple/Main.hs

@@ -1,4 +1,4 @@
-import Plugins
+import System.Plugins
 import StringProcessorAPI
 import System.Console.Readline
 import System.Exit