Update examples

testsuite/eval/eval1/Main.hs

@@ -0,0 +1,5 @@
+
+import System.Eval.Haskell
+
+main = do i <- eval "1 + 6 :: Int" [] :: IO (Maybe Int)
+          if isJust i then putStrLn $ show (fromJust i) else return ()

testsuite/eval/eval1/Makefile

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+TOP=../../..
+include ../../eval.mk

testsuite/eval/eval1/expected

@@ -0,0 +1 @@
+7