Bugs in the react-tutorial.

[ShubhankarKG]

I found some discrepancies in the react app tutorial contained in this repo. I would like to point those out:

1. No Support for HOC : I can directly access the url http://localhost:3000/todo without the need for registering (which is bad). We can implement HOC that will take care of this.
2. No Alert facility : The signin/signup components do not provide the facility for checking completeness. Although the button does not work, looks good if we have a completeness feature enabled.
3. Documentation: The Readme is also a one-liner. We can improve upon it.

I can do the needful given some time (probably after my mid-semester exams get over in college).
Please revert the same.

[YourTechBud]

There are quite a few things which are incorrect in this sample, most importantly the client api version is incorrect

[ShubhankarKG]

It would be good if you could update the sample with the recent client api. Meanwhile I'll focus on improving the docs a little bit.