Update appveyor.yml.

Remove the unneeded grunt-cli global installation since it's in devDependencies.

appveyor.yml

@@ -19,7 +19,6 @@ environment:
 
 install:
   - ps: Install-Product node $env:nodejs_version
-  - npm install -g grunt-cli
   - npm install
 
 build: off
@@ -32,6 +31,5 @@ matrix:
   fast_finish: true
 
 cache:
-  - '%APPDATA%\npm\node_modules -> package.json'    # global npm modules
-  - '%APPDATA%\npm-cache -> package.json'           # npm cache
-  - 'node_modules -> package.json'                  # local npm modules
+  - '%APPDATA%\npm-cache -> package.json'       # npm cache
+  - 'node_modules -> package.json'              # local npm modules

package.json

@@ -1,6 +1,6 @@
 {
   "name": "grunt-contrib-jasmine",
-  "description": "Run jasmine specs headlessly through PhantomJS.",
+  "description": "Run jasmine specs headlessly through PhantomJS",
   "version": "0.8.2",
   "author": {
     "name": "Grunt Team",