Add error parser / normaliser

[sjurgis]

The resulting error array is quite painful to parse, as a result I've wrote this spaghetti that recursively parses errors into a single array of messages.

It could probably be improved by adding errorType property.
It would be nice to just go enqueue(...).withErrorParser() and get simply iterable list of exceptions that you could just .join() and print to the screen.

getErrors : function(errors) {
   var messages = [];
   var helper = this;
   if(errors){
     var errata = Array.isArray(errors) ? errors : errors.entries;
     if(errata){
       errata.forEach(function(i){
        if(i.message) messages.push(i.message);
        if(i.pageErrors && i.pageErrors.length > 0) messages = [].concat(messages, helper.getErrors(i.pageErrors));
        if(i.fieldErrors) messages = [].concat(messages, helper.getErrors([].concat.apply([], Object.keys(i.fieldErrors).map(function(key) { return i.fieldErrors[key] }))));
       }) 
     }
   }
   return messages;
  }

[ruslan-kurchenko]

Hey @sjurgis!
Sounds good to me.
What about "plugin/feature" based approach? For example, create hooks in the component behavior where you can embed custom functionality as you mentioned?
Or, do you think it will be better to "hardcode/add" your function (decorator) directly to the component?

[ruslan-kurchenko]

Merged into #21