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 must point to a specific commit for security reasons. NPM is bad enough with security as it is. :P

Note [how we do it with our version of native-dns in package.json](https://github.com/okTurtles/dnschain/blob/86a3b00eb10e81128e800b47e812736d263e9b73/package.json#L45).