Merge pull request #96 from kostajh/refactor_bugwarrior_ac3

ActiveCollab 3.x/4.x support
Start up a new hacking doc.
Ignore eggs.
Add a phabricator service.
Initial work on adding a pre_import hook
Merge pull request #99 from kostajh/hooks

Add a pre-import hook
Use FOREIGN_ID for task matching instead of PERMALINK