Add middleware architecture so that you perform actions on your data when saving or getting it from blockstack

[jorishermans]

Like with connect in node.js you can have the ability to add rules whenever some data comes in or out that you do the same kind of action.

So when a user save a document you can create a spellchecker middleware implementation so that before it gets been saved it is been spellchecked. If you want to have it on specific files you can do that as well.