Update gitbook to 0.3.2

Author: SamyPesse

package.json

@@ -11,7 +11,7 @@
  "dependencies": {},
  "devDependencies": {
  "grunt": "~0.4.1",
- "grunt-gitbook": "0.3.0",
+ "grunt-gitbook": "0.3.2",
  "grunt-gh-pages": "0.9.1",
  "grunt-contrib-clean": "~0.5.0"
  },