Add Auth.elm for 7 and 8 and a .gitignore exclusion for them

part7/.gitignore

@@ -0,0 +1 @@
+!Auth.elm

part7/README.md

@@ -1,4 +1,4 @@
-Part 6
+Part 7
 ======
 
 ## Installation

part7/test/Auth.elm

@@ -0,0 +1,6 @@
+module Auth (token) where
+
+
+token =
+  -- Tests don't need a real token.
+  ""

part8/test/.gitignore

@@ -0,0 +1 @@
+!Auth.elm

part8/test/Auth.elm

@@ -0,0 +1,6 @@
+module Auth (token) where
+
+
+token =
+  -- Tests don't need a real token.
+  ""