comp AP gateway: signature checking, caching and threads management: - HTTP signature is checked for incoming messages - AP actor can now be followed using pubsub subscription. When following is accepted, the node is cached - replies to posts are put in cached pubsub comment nodes, with a `comments_max_depth` option to limit the number of comment nodes for a root message (documentation will come to explain this). ticket 364

syntax: glob
*.pyc
*.pyv
*.swp
*.swo
tags
twistd.log
twistd.pid
bridge_constructor/generated
tests/e2e/report*
_trial_temp/
sat.egg-info
*.un~
dist
MANIFEST
build
ctags_links/
Session.vim
.build
.pytest_cache