Fix typo
Recommend using `bundle install` instead of `bundle up`
Delay defining SassFilesystemImporter

Since Sass is required lazily, SassFilesystemImporter should be defined
after it's loaded.
Exclude more Array instance methods from forwarding.

Fixes #244
Encoding & better place for the extracted file
Update version to 3.6.1
Add 3.6.1 release notes
Fix warnings regarding {s and }s in regexes
Update release notes for 3.6.1
Let files_to_watch contain nanoc.yaml instead of config.yaml by default
Update release notes for 3.6.1
Naming checks: be as flexible as rules