changed name from articles to resources
added resource and category associations and corresponding migrations
able to create a new topic
added a validation to the category
able to create a new resource
Merge pull request #5 from SDRubyStudyGroup/megan

I added Posts and the beginnings of Comments
Merge branch 'master' into forms
Merge branch 'forms'
Merge branch 'master' of https://github.com/SDRubyStudyGroup/chat_ruby

Conflicts:
	config/routes.rb
	db/schema.rb
authenticate users filter and start polymorphic comments