add person id to messages
Show each person's profile picture and their latest message
change root path
Use RSpec for testing
Setup spec using RSpec, FactoryGiry, CapyBara, Faker
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Merge branch 'master' into issue-3

Conflicts:
	db/migrate/20140305084342_add_person_id_to_messages.rb
	db/schema.rb
Refactor all occurrences of messages to activities