share .gitattributes, so the custom binary diff generator is simpler …

…to set up

.gitattributes

@@ -0,0 +1,5 @@
+*.bcs diff=ie
+*.chu diff=ie
+*.pro diff=ie
+*.spl diff=ie
+*.vvc diff=ie

admin/enable-ie-git-diff

@@ -3,18 +3,9 @@
 # output diffs of text dumps of the binary files it supports instead of just skipping
 # them.
 
-#1. Install either.
+#1. Install either tool.
 
-#2. Register the blob types
-cat >> .gitattributes <<-"IE"
-*.bcs diff=ie
-*.chu diff=ie
-*.pro diff=ie
-*.spl diff=ie
-*.vvc diff=ie
-IE
-
-#3. Define the new diff driver and optionally make it cache the results:
+#2. Define the new diff driver and optionally make it cache the results:
 # NOTE: use the correct path if the binary is not in the system path!
 
 cat >> .git/config <<-"IE"