changes in 2 migration files
Requested columns added #153 & foreign key changes
Requested Migration files added
Merge pull request #158 from Saftophobia/Database

Database
updating_migration_files_related_to_groups_part
request to modify migration files
Merge pull request #164 from Saftophobia/C4_Ola_Migration_Entity_Status_#162

request to modify migration files
 Changes according to issue #163
Update like.rb
Update group.rb
Update startup.rb
Update 20140420180322_create_startups_and_groups.rb
Update 20140420184352_create_posts.rb
Update 20140420190647_create_comments.rb
Update 20140422203611_create_likes.rb
Merge pull request #161 from Saftophobia/adding_migration_files

updating_migration_files_related_to_groups_part
Merge pull request #166 from Saftophobia/Database

 Changes according to issue #163
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