Merge pull request #347 from smfreegard/master

Add new AVG plugin
Merge pull request #348 from smfreegard/master

Add new SPF plugin, library and tool
Add auth_ldap files.
Added Dockerfile
o Fix ldaps to accept self-signed CAs
o Try DNs in series, since parallel is a violation of LDAP spec
o Unbind after successful bind
o Clean-up docs and ready for pkging.
Make auth subdirectory on install
Use example domain
Add directory for auth plugins, not just their docs...
Fix mark-up
Merge pull request #351 from jplock/dockerfile

Added Dockerfile
Fix more markup
Update auth_ldap.md
Move dependency
Merge branch 'add_auth_ldap' of https://github.com/tstonis/Haraka into add_auth_ldap
Merge pull request #352 from tstonis/add_auth_ldap

Add auth ldap
Remove ldap auth now we have it
Don't set state to null on resume() without pause()
Improve outbound delivery logging