version 1

[creynders]

@JedWatson just pushed the first version to a v1 branch. Let me know what you think of the API.
I've expanded it to include some very useful methods.

In a nutshell, the API's:

• pre

• post

• hookup Sets up a hook.

  field.hookup('pre:save', fn);
  //equals:
  field.pre('save', fn);

• hookable (used to be register)

  field.hookable('pre:save'); //only allows 'pre:save' hooks
  field.hookable('save'); //allows 'pre:save' and 'post:save' hooks

• hooks iterates over all hooks

• emit calls hooks

  field.emit("pre:save", foo, bar); // all "pre:save" hooks called with foo and bar as parameter

• unhook removes a hook

   //removes `onFieldSave` as a `pre:save` hook
   field.unhook( 'pre:save', onFieldSave );
   //removes ALL hooks for `pre:save`
   field.unhook('pre:save');
   //removes ALL `pre` hooks
   field.unhook('pre');
   //removes ALL hooks, i.e. `pre` AND `post`
   field.unhook();

• hooked wraps a method with pre and post emissions

  field.save = function(){
      console.log('SAVE');
  }
  field.hooked("save");
  field.pre("save", function(){
    console.log("pre:save called");
  });
  field.save();
  //outputs:
  //pre:save called
  //SAVE

Tests aren't finished yet and I need to add a few more sanity checks

[creynders]

Updated API and tests. WARNING: this depends on an unpublished version of asyncdi where all my PR's have been merged into.

[creynders]

@JedWatson good to go I think, but the new version of asyncdi needs to be published first. I assumed it'll be v1.1.0 ...

[JedWatson]

Nice work! Merging for final review / collaboration / release 😄