Fix hooks-install

package.json

@@ -59,7 +59,7 @@
     "preversion": "./scripts/preversion.sh",
     "version": "./scripts/version.sh",
     "postversion": "./scripts/postversion.sh",
-    "postinstall": "git config --replace-all core.hooksPath scripts/hooks"
+    "postinstall": "./scripts/setup-hooks"
   },
   "nyc": {
     "instrument": false,

scripts/setup-hooks

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+# ensure all commands are run from the root dir, for simplicity
+cd "$SCRIPT_DIR/.."
+
+# only install git hooks for people developing Sinon
+if basename $PWD > /dev/null && [[ -e .git/config ]] ; then
+    git config --replace-all core.hooksPath scripts/hooks
+fi