9-3 Clear errors after 3 seconds
9-4 Validate post contents on submision
9-5 Validate post contents when editing and fix typo
10-1 Added comments collection, pub/sub and fixtures.
10-2 Display comments on 'postPage'.
10-3 Create a form to submit comments.
10-4 Made a simple publication/subscription for comments.
10-5 Denormalized the number of comments into the post. So it can be access with out pull all the data from the comments
11-1 Add basic notifications collection, and create a notification when a comment is created.
11-2 Display notifications in the header.
11-3 Only sync notifications that are relevant to the user.