Merge pull request #15 from pveller/master

Extend "How Do I" section to show how to create fake items under system and media library
Updated code samples
Formatted
FakeRoleProvider methods do nothing instead of throwing NotImplemented exception
IBehavior renamed to IThreadLocalProvider
Implemented FakeRoleProvider
Implemented RoleProviderSwitcher
Implemened stubs for Get and SetAccessRules methods
Temporary disabled unstable Query test
Can set and get access rules
Removed unused classes
Make access rules storage thread local
Init and release the authorixation provider
Fixed temporary ignored DbConcurrencyTest
Added AuthenticationSwitcherTest
Fixed annoying warnings
AccessRules storage moved to DataStorage
Introduced FakeRolesInRolesProvider
Updated readme
Fixed links