add our log customizations to the model

These changes were lost when the postgresql cookbook was updated to
upstream's version.
Merge pull request #97 from mapleoin/log-model

add our log customizations to the model
Add optional crowbar-applied boolean attribute to schema

Set it to false by default in the json and update proposal schema
version to 3.
Merge pull request #98 from bkutil/add_applied_attribute

Add applied attribute