COOK-3360: update for application 3.0.0 cookbook
release v2.0.0
increment version for development
Merge branch 'COOK-3360'
[COOK-3563] Replace calls to Chef::Mixin::RecipeDefinitionDSLCore

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
Update CHANGELOG
Updated README format
Use new CONTRIBUTING.md
Update Copyright in README
Version bump to v3.0.0
Version bump to v3.0.1