fix for deps that depend on other local deps

[drewbanin]

dbt currently fails if a dep depends on a different local dep. I kind of found myself with a stacktrace by accident, as this is a pretty strange situation to find yourself in.

I added a simple test for a local package, since i don't think we currently have one of those. We should add another test to test the error case fixed by this PR though.

This originally failed with:

2018-11-13 21:43:24,828 (MainThread): __init__() takes 1 positional argument but 2 were given
2018-11-13 21:43:24,835 (MainThread): Traceback (most recent call last):
  File "/Users/drew/fishtown/dbt/dbt/main.py", line 76, in main
    results, succeeded = handle_and_check(args)
  File "/Users/drew/fishtown/dbt/dbt/main.py", line 126, in handle_and_check
    task, res = run_from_args(parsed)
  File "/Users/drew/fishtown/dbt/dbt/main.py", line 181, in run_from_args
    results = run_from_task(task, cfg, parsed)
  File "/Users/drew/fishtown/dbt/dbt/main.py", line 189, in run_from_task
    result = task.run()
  File "/Users/drew/fishtown/dbt/dbt/task/deps.py", line 438, in run
    final_deps.incorporate(package)
  File "/Users/drew/fishtown/dbt/dbt/task/deps.py", line 334, in incorporate
    self[package.name] = self[package.name].incorporate(package)
  File "/Users/drew/fishtown/dbt/dbt/task/deps.py", line 261, in incorporate
    return LocalPackage(self.local)
  File "/Users/drew/fishtown/dbt/dbt/task/deps.py", line 31, in __init__
    super(Package, self).__init__(*args, **kwargs)
TypeError: __init__() takes 1 positional argument but 2 were given

[beckjake]

Good find, nice test!