Adding new recipe for nginx config (#4910)
Deleted cron entry from recipes/default.rb
Added template for authentication in different environments
Comments removed
Merge branch 'master' into issue-4910

Conflicts:
	cookbooks/main/recipes/default.rb
Refining recipe to apply nginx config to web server instances (ExamTime/ExamTime#4910)

Also don't add HTTP Auth on production environment.
Removing unnecessary file for custom.conf, this will be generated from a template.

See ExamTime/ExamTime#4910.
Merge pull request #3 from ExamTime/issue-4910

Issue 4910 - Chef recipe for Nginx config