Added "image_number" column to images table.  If the file name is 5.jpg, this will the image_number will be '5'
When uploading a new narrative, the correct value will be stored in the "image_number" column.
Clean up database. Add overwritten changes.
remove sqlite3-journal and change gitgnore
Add data into language and category. Add three narratives and four comments as sample data.
Merge pull request #16 from felixsoum/backend-dev

Backend dev