Feature/node support

This pull request allows for functionality on `node` with or without a remote connected. Previously we relied on the `Authorize` module to do stuff before we could be "ready" but in node the `Authorize` module returns false in `_rs_supported` (no dom). 

* allow for configuration of logging during `new RemoteStorage({logging: true})` otherwise we miss initialization messages in node.
* added `hasFeature` to check if we loaded `Authorize` or not. If not, fire the `this.remote.stopWaitingForToken()` method to keep things moving. 

Currently I've tested this the remotestorage-modules repo, though I have nothing committed yet.  You can use this demo script: 
```
var RemoteStorage = require('remotestoragejs');
var remoteStorage = new RemoteStorage({
  logging: false
});
global.remoteStorage = remoteStorage;

remoteStorage.on('ready', function () {
  console.log('ready!');

  remoteStorage.bookmarks.archive.store({
    url: 'testurl',
    title: 'this about Me'
  }).then(function (bm) {
    console.log('-- stored a bookmark: ', bm);
    remoteStorage.bookmarks.archive.getAll().then(
      function (bookmarks) {
        console.log('-- all bookmarks', bookmarks);
      },
      function (error) {
        console.log('error fetching all bookmarks', error);
      }
    );
  });

});

require('./remotestorage-bookmarks');

remoteStorage.access.claim('bookmarks', 'rw');
console.log('access claimed');

remoteStorage.caching.enable('/bookmarks/archive/');
console.log('caching enabled');

var client = remoteStorage.bookmarks.client.scope('archive/');

client.on('change', function(event){
    console.log('change event', event);
});
```

You'll need the `bookmarks` module, and will need to symlink the remotestorage.js repository to `node_modules/remotestoragejs`
This is missing some context/explanation.

Also,  this is usually done by the library and logging is configured in a different way. As far as I see, this is how you do it in node.js now, but if this applies to node.js *only*, we should probably document it in something like a "how to use rs.js. with node" guide/page/howto instead?