Remove mark imcomplete.

Ready for test.
Modify haik_files table schema.

- path column: because path is creatable with site ID and key
+ ext column: save extension on upload file
* make value column nullable: normaly value is null
Merge pull request #82 from toiee/modify-migration

Modify haik_files table schema.
Merge branch 'master' into implement-file-repository
Fix using DB column name.

site_id -> haik_site_id
Modify tests