Luigi Contrib Modules where moved

[xaedes]

See this luigi commit:
spotify/luigi@781613e

breaking: Remove deprecated contrib redirections (#2181)

After this commit the following imports will no longer work

 import luigi.s3
 import luigi.postgres

Instead use

 import luigi.contrib.{s3,postgres}>  

Results in following error:

Traceback (most recent call last):
File "workflow.py", line 2, in
import sciluigi as sl
File "/usr/local/lib/python3.5/dist-packages/sciluigi/init.py", line 11, in
from sciluigi import dependencies
File "/usr/local/lib/python3.5/dist-packages/sciluigi/dependencies.py", line 7, in
from luigi.postgres import PostgresTarget
ImportError: No module named 'luigi.postgres'

[samuell]

Should be fixed with #40 that was now merged.

[samuell]

Closing now, please report if any remaining errors!