Create search plugin
Merge branch 'master' into feature-search-plugin
Merge branch 'master' into feature-search-plugin
Merge branch 'master' into feature-search-plugin
Add tests for FileTypeResolver
Add interface FileTypeResolverInterface
Implement FileTypeResolver
Add search convert view

Fix convert method
Rename FileTypeResolver to MimeTypeResolver
Delete FileTypeResolverInterface
Rename test class and unmark incomplete
Modify test for results with mime-type-encoding
Add resolving by extension.

e.g. hoge.jpg => image/jpeg
Add Comment how to use public
Add SearchItemInterface for search
[WIP] Add file-type resolver class.

This class provides getting haik-file-type from mime-type
Add scope methods and implement SearchItemInterface
Add Haik::search in SiteManager
Add views for search plugin
Fix action method in Search Plugin