COOK-3027 Default site enable true->false not right outcome

This commit fixes an issue where a converge with
default_site_enabled = true, then default_site_enabled = false,
does not disable the default site.
[COOK-3018] - update notification syntax
[COOK-2634, COOK-2179] - use https for Gemfile
[COOK-3109] - remove extraneous apostrophe from arch regexp
Merge pull request #70 from mapleoin/COOK-3109

[COOK-3109] - remove extraneous apostrophe from arch regexp
Merge pull request #65 from jblaine/bool-negate

COOK-3027 Default site enable true->false not right outcome
release v1.6.4
release v1.6.6
increment version for development