packages management and run demos with celery enabled installing -master and -worker optional packages
packages management and run demos with celery enabled installing -master and -worker optional packages


Former-commit-id: 1f4c5297bd720011c3ff260a77ca3580223fe8d4 [formerly 0361635b3850505c24c77e06026b306b0f67cda4] [formerly 0361635b3850505c24c77e06026b306b0f67cda4 [formerly da12a32a93d62ae5051abcef08ddcd29647a80be]]
Former-commit-id: 1b8804a146487ce8be59bd029247a8f3c07ab7b8
Former-commit-id: 407dafd6dbace1f085e1ee06d0511f759fb9f2ad
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine