Con 549

https://wikia-inc.atlassian.net/browse/CON-549

Changes made according to WikiaHubsV2:

1. Using array with parameters instead of lang, vertical, section
2. Preparation for removing section id
3. Preparation for fetching data using city_id
4. Combined WikiaHubsV2Model and WikiaHubsV3Model to WikiaHubsModel and moved to WikiaHubsService
5. Removed global search from hubs v3
6. Changed messages keys
7. CSS refactor (ie. removed styles for hubs v1, changed layout colors)
8. Changed way to indentify hub (v3) page in HubService
9. New page header for hubs
10. Changed way to naming hub page ( wgWikiaHubPageName -> array( lang => hub name) )