pull-requests: increase stability of concurrent pull requests creation by flushing prematurly the statuses of commits. This is required to increase the versions on each concurrent call. Otherwise we could get into an integrity errors of commitsha+version+repo

forks: don't expose fork link if we don't have permission to read it, and also don't pre-select in pull request.

env-vars: provide better feedback when formatting an env variable fails.

rcextensions: updated examples, and made http_call util use the method parameter.

docs: added tip for faster nix-shell by pre-installing phantomJS

docs: updated copyrights to 2019

dependencies: bumped dogpile.cache to 0.7.1

dependencies: bumped supervisor to 3.3.5

dependencies: bumped subprocess32 to 3.5.3

dependencies: bumped pyramid-debugtoolbar to 4.5.0