Revert "Merge branch 'origin/os-tdd'"

This reverts commit 7f8cbf55f66a5da64412a7dc8f74c62cba4093b2, reversing
changes made to 89e54e86a433546e7ca7d514a7c9dbbca27fa8b4.
Fixed lost of dismisable alerts.
Validation on the fly for Settings.
Project reorganization.

1. Deleted controller SettingsController. And deleted corresponding
views (Mathes, Prices, Sectors, Stadiums)
2. Deleted all superfluous views (_Layout.cshtml, Error.cshtml)
3. Added to _SettingsLayout list-group from deleted Stadiums.cshtml
3. Changed all links on Settings/Stadiums to StadiumSetting/Index
4. Some refactoring
Fixed save prices button.
Fixed case two click Save in Stadiums, Sectors and Match.