move user model specs to ./spec/model
Add micropost model and specs for it
add microposts rendering on user profile page

added rake task and factory to populate microposts
Add create and view micropost
Refactor specs
change home page to new_post_idea page
Seed data for populating db

Rake tasks for generating first 50 users
and 30 posts for first 6 of them
Fix broken build due to header content in specs
add sign in link when current_user is nil
Merge branch 'microposts'

Conflicts:
	app/helpers/sessions_helper.rb
Merge conflicts