Db aliases

[gvilarino]

This PR makes it easy to integrate notifier with DBs with different schema names than the ones expected by notifier.

For instance, if instead of having your app users under a mongo collection named user you would have a hard time integrating notifier into it.

You can now specify aliases for collection names easily in your config files:

db: {
  connection: /*...*/,
  aliases: {
     user: "players"
  }
}

...

That would make all calls to db.user actually use the players colleciton in your DB.

The only change needed by this PR is that config files now have this db element and having connection inside of it. But the sample file modifications are also included here.

P.S.: I know there are a lot of changes in the PR but that's because I forked before the 0.1.0 release. It shouldn't affect anything.

[gvilarino]

Actually, disregard this PR; it contains way too many changes, like support for jade templates and i18n.

I need to make these more organized and clear before commiting a PR

[alexbeletsky]

Thx @gvilarino I will wait for smaller one :)

[gvilarino]

It's now available on #12 :)