deferred hook

Adding support for a new hook  “deferred” to be called if the message
delivery is getting delayed.
Merge pull request #529 from smfreegard/master

Merged
Merge pull request #530 from smfreegard/master

Remove additional Travis icon added in error
access: new plugin, one access plugin to rule them all

Includes the same functionality as rdns_access, mail_from.access,
and rcpt_to.access plugins, using the same config files.

Includes the regex blocking function of the helo.checks match_re function.

1. Config files are automatically updated after changes (callback)
2. Preprocessing of config files, to reduce run-time processing
3. Validation of RegExp entries, so one bad pattern doesn't disable them all
4. For ACH hits, adds the ACL file name with the matching entry to results
5. Tests, tests, and more tests! (79 of them)
6. Removes duplicated docs (with 3 plugins having almost identical contents)
7. Removes duplicated code among the 3 plugins
8. Consolidates 3 config files with one setting each into access.ini
remove *.access.ini files, prepend 'haraka -h access' to config files

disable *.access plugins and enable access.js in config/plugins
access: added [check] section for enable/disable hooks

added (hook) suffix to pass results
for whitelisted IPs, also set whitelist=true in result store
access: docs and features for 'any' usage
access: updated access.md
access: apply settings from old plugin .ini files (if present)
access: update tests
access: add deprecated notice to legacy plugins
access: added better *Upgrading* instructions
access: add results when any passes
Merge pull request #525 from msimerson/access

Access
asn: handle the "DNS bug" issue for asn.routeviews

recap: some versions of node concatenate messages with no delimiter, making it impossible to parse the distinct messages from a TXT record
asn: log the obj results (for curiosities sake)
Merge pull request #532 from msimerson/asn

asn: handle the "DNS bug" issue for asn.routeviews
net_utils: move is_ipv4_literal into net_utils
Merge pull request #535 from msimerson/net_utils

net_utils: move is_ipv4_literal into net_utils
net_utils: added get_public_ip, using 'stun' package