Merge pull request #7 from guillermo-carrasco/celery

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

Merge from NGI repo
Merge pull request #9 from mariogiov/devel

Config file changes
Merge branch 'devel' of github.com:NationalGenomicsInfrastructure/ngi_pipeline into celery