* Specs for language detection
* Use CharlockHolmes instead of NKF
* Correct mistakes
* Correct style
* Set hint_enc instead of falling back and strip_tags
* Improve specs
* Add dependencies
* Do not default the format in ProviderDiscovery
The format should be determined when discovering, as it is in the current
implementation, and it is a flaw if it is not determined.
* Spec ProviderDiscovery
* Fix#2119 - Whenever about to send a HTTP request, normalize the URI
* Add test for IDN request in FetchLinkCardService
* Perform IDN normalization on domains before they are stored in the DB
Akihiko Odaki