[WIP] Feature File Upload
Add routes.

GET /cmd/filr/: show list
GET /cmd/filr/upload: show upload form
POST /cmd/filr/upload: upload file
Add stab controller
Add migration: files_table
Add Filr model
Add dir: haik-contents/files for upload files
Modify migration: files table.

Remove dimension column
Modify Filr model.

Add setType method for determine file type
Add setFilePath method for store file
Add config haik.file.path as file storage
Modify filr plugin controller

Show form.
Upload and save file.
Modify Filr model

Add formatted size accessor
Modify FilrPluginController

Fix route
Add list action
Add view file
Add nav to view files
Merge pull request #34 from hokuken-inc/add-file-upload

Feature File Upload