create posts table and class, migrate
Merge pull request #8 from gopher-snakes-2013/add-posts-table

create posts table and class, migrate
Merge branch 'master' into disc_input_form

It's necessary.
Squished Sinatra bugs
Merged Post Table branch
  -- new post model
  -- new post migration
Created discussion posts route
Updated view.erb file to handle posts on discussion page