fix ($compile): keeps prototype properties for template URL directives

[hannahhoward]

currently, if a directive definition objects has prototype properties, such as a compile function, those are lost when compiled if the directive has a templateUrl function. Steps to reproduce:

directive("templateUrlDoesntWork", function() {
   var base = {
      compile: function() { 
         return function(scope, element, attrs) {
            scope.value = "Test"
         }
     }
  }
  inherited = Object.create(base)
  inherited.templateUrl = "test.html"
  return inherited;
}

The DDO's compile function will never be called. On the other hand the same version with a plain template works:

directive("templateWorks", function() {
   var base = {
      compile: function() { 
         return function(scope, element, attrs) {
            scope.value = "Test"
         }
     }
  }
  inherited = Object.create(base)
  inherited.template = "<p>{{value}}<p>"
  return inherited;
}

The DDO's compile function will be called.

This makes a difference for an increasing number of people particularly who are experimenting with ES6 classes in Angular 1.x.

[caitp]

i could see this being useful for typescript/coffeescript users, and it is a pretty small fix. lgtm, but wait for pete or someone else to signoff on it

[caitp]

Marking this for beta 3, but this should probably wait for beta 4. /cc @petebacondarwin

[petebacondarwin]

LGTM - let's get this in next week. Thanks for taking a look @caitp and pinging me.

[lgalfaso]

looks good, the only thing I would like to see is the same test using template. I know that this test would pass even without the PR, but having a test in place would reassure that this does not break in the future

[petebacondarwin]

Quick work @hannahhoward - nicely done and nice PR. Thanks

[hannahhoward]

added second test per request. and removed the accidental leftover console.log. I'm not sure why the build is failing on Firefox 31.0 on Linux

[realityking]

This comment doesn't reflect the code below it anymore.

[hannahhoward]

removed the outdated comment

[lgalfaso]

Looks very good. Just one more thing @hannahhoward can you please squash everything into one commit? Thanks!

[petebacondarwin]

Actually @hannahhoward don't worry, we can squash when we merge.