New: Added Admin page (fixes #30)

Fixes #30

Following are the changes made:

* Supports save and reload of config.
* Picks up the config with a higher priority as mentioned in the README.
* Runs with ```grunt admin```
* Uses react and coffeescript

Any suggestions on how to go about on the below points?

* Support of https ( Need certificates. Related to #58? )
* Restart of other servers on save. (Should ```example.coffee``` be made a module?)
* Graph ( depends on #10 )
This is coffeescript, no need for this `Object.keys` business. Do:

```coffeescript
for k,v of nconf.stores.defaults.store
    c.config[k] = v
```

Or something like that. Also, this code needs comments above it explaining what's going on. For example, it's not clear to me just looking at this (without having to read all the rest of the code) why you are copying `gConf` instead of accessing it directly.