Showing answers in the instance detail page
Adding a message detail url pointing anywhere
Adding message detail view
Adding migration
Fixing a bug that would not let the creation of answers
Link to the message detail view in the instance
It says that there are no messages when there are no messages
Fixes some css issues
Missing data in the yaml file was causing 2 tests to fail [link to the travis work](https://travis-ci.org/ciudadanointeligente/write-it/builds/7204880) but now those two are ok
Merge pull request #80 from ciudadanointeligente/message_has_answers

Message has answers