Fixed 4 problems of the sc2-cookie project

• New Features

I find there are some problems in the project during I used it in my project. I fixed 4 problems listed as below:

1. Fix the <a> tag do not work problem. Before I fix this, all the links in the project are not working.
2. Delete the cookie when logout. Before I fix this, after you log out, refresh the page, the status will be loggin again.
3. Save the cookie on the base uri. Before I fix this, it's working fine in this project. But if you use the same code in other project, then it will not work.
4. Deleted useless if sentense. the if sentense always return true.

• How did I implement them
  Link to relevant lines in the code on GitHub and explain briefly what you added/changed.

1. Item 1: added two options to the config method of the module: requireBase: true, and rewriteLinks: false.
2. Item 2: add ipCookie.remove('st_access_token', {path:'/'}); to the function $scope.logout.
3. Item 3: changed the $scope.logout and the controller of SetCookies.
4. Item 4: delete the first if function in app.js.