Merge pull request #1 from mariogiov/devel

Change name to ngi_pipeline
Remane sll --> ngi, fixes #2
Check that restrict_to_projects and restrict_to_samples are not None. Fixes #3
Merge pull request #8 from mariogiov/devel

Bunches of code
Merge @mariogiov changes
Merge pull request #7 from guillermo-carrasco/celery

Add Celery dependency to requirements.txt; remove EOL whitespace, foulest of all whitespaces
Merge pull request #1 from NationalGenomicsInfrastructure/devel

Merge from NGI repo