added comment migration with polymorphic reference
Merge pull request #6 from cprater/comments_migration

added comment migration with polymorphic reference
fixed comment migration and created empty comment model
Merge pull request #7 from cprater/comment_model

fixed comment migration and created empty comment model
created a placeholder home page
Merge pull request #8 from cprater/comment_associations

created a placeholder home page
fixing merge conflicts in schema