[Seo] Improve SeoMetadata model and create AlternateLanguage model.
Improve seo metadata form type.
Merged with master.
[Form] Fixed tag form javascript, add key value collection template.
[Seo] Fixed form test.
Merge pull request #6 from tadcka/seo

[Seo] Add extra http, names, properties fields to seo metadata model.
[Seo] Improve seo presentation.
[Seo] CS.