closes#4608, #4609
- image handler loads in any image files & figures out where they'll get stored
- image importer has a preprocessor which replaces image paths in
pertinent spots of post, tag and user models
- image importer stores images, keeping the path where it makes sense
- basic test for the preprocessor
refs #4605, #4479
- Removes versioning from the importer
- Fixes an issue with SQLITE errors not being thrown properly for posts
- Ensures that posts have a created_at date
- Makes sure that the API wrapper is properly handled
refs #4605
- Move as much code as possible out of the DB API
- Split the importer into 2 concepts, code which handles different
filetypes and code which takes the content of files and imports it into
Ghost in some way
- Split the import process into 4 steps, load the file into a useful
format, preprocess the data, do the import, generate a report
- Reporting is currently a no-op
- Adds a basic level of testing
