pylons: remove pylons as dependency - dependencies: bumped: -setuptools-scm==1.15.6 -celery==4.1.0 -kombu==4.1.0 -pytz==2017.3 -Routes==2.4.1 Removed all pylons components. Refactored the code to use only pyramid parts

dependencies: bumped pastescript to 2.0.2

tests: improve assert_flash_message call when called with no_ and empty flash is present.

dependencies: bumped appenlight client to 0.6.22

dependencies: removed supervisor as it's no longer required.

dependencies: py-gfm is now available via pypi

auth: remove pylons i18n and replaced it with pyramid translation

release: merge back stable branch into default

release: merge back stable branch into default

db: ported init_model to pyramid.