Create barebones prototype
Set revison.content type to TEXT
Migrate events.http_method datatype to enum

Clean up tab spacing to 2 chars
Remove redundant setting of created_at as it is handled by the
framework
Fix typo in migration comment and filename
Merge migrations into 1 file

This prevents unnecessary tweaking of down_revisions when the
merge with development takes time
Added context_id to events and revisions
Fix code indentation