Include test to show error introduced with last embedded changes
AdapterPopulatedRecordArray triggers `didLoad` event at the end of the runLoooop

- Fixed reported integration tests
- Add Em.run to some tests which became invalid with this change
This allow to define integer ids in the fixtures, as well as integers

correct test title
Add a space in the assertion message
Merge pull request #618 from marktheunissen/minor-type-in-assertion

Add a space in the assertion message
Merge pull request #605 from sly7-7/fixture-adapter-coerce-ids

Allow to define integer ids in the fixtures, as well as string
Merge pull request #580 from ppcano/load-async-error

Trigger didLoad event in the `AdapterPopulatedRecordArray` at the end of the runloop
Demonstrate unwanted record sharing.

By adding a pingbacks relationship and not modifying it in any test, we
should end up with an empty array in all serialized Posts, i.e.

    {
        "post": {
            "comments": [
                {
                    "title": "Wouldn't a more lightweight...",
                    "user": null
                },
                {
                    "title": "This does not seem to reflect...",
                    "user": null
                }
            ],
            "pingbacks": [],
            "title": "A New MVC Framework in Under 100 Lines of Code"
        }
    }

However, what we get is

    {
        "post": {
            "comments": [
                {
                    "title": "Wouldn't a more lightweight...",
                    "user": null
                },
                {
                    "title": "This does not seem to reflect...",
                    "user": null
                }
            ],
            "pingbacks": [
                {
                    "title": "Wouldn't a more lightweight...",
                    "user": null
                },
                {
                    "title": "This does not seem to reflect...",
                    "user": null
                }
            ],
            "title": "A New MVC Framework in Under 100 Lines of Code"
        }
    }
Consider relationship for embedded hasMany records.

When serializing a relationship, the previous algorithm serialized all
records in _all_ has-many relationships, not just all records for the
specified relationship.
Only serialize has-manys that are embedded
Using FixtureAdapter, ids must be defined in the FIXTURES
improve error message
Merge pull request #624 from sly7-7/fixtures-must-have-ids

Fixtures must have ids
Merge branch 'master' of git://github.com/emberjs/data