Fix PageMeta::setYaml occuring exception when empty yaml string passed
Add Remember me feature.

When login check "Remember Me" then remember session long time.
Merge pull request #25 from hokuken-inc/feature-remember-me

Add Remember me feature.
[WIP] Caching Page Data
Use Cache on GET: show_page
Forget page cache when page save
Merge pull request #29 from hokuken-inc/feature-cache-page

Caching Page Data
Add delete action at EditPluginController

Add routes: /cmd/delete
GET: soft delete
POST: force delete

Add tests
Modify Page model enabling soft-delete
Merge pull request #31 from hokuken-inc/feature-page-soft-delete

Feature page soft delete
Modify determining theme at PageController.

Config has default theme name `ikk`.
Add PageList Plugin and routes.

* GET: cmd/list: show page list
* GET: sitemap.xml: show site map XML formatted
Add method to Page model for get priority fot site map.

Top layer: 1.0
Second layer: 0.8
Third layer and more depth: 0.6
Use priority
Add cmd/list.json route

Response page list formatted JSON.
Merge pull request #32 from hokuken-inc/feature-list-plugin

Add PageList Plugin and routes.
[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