Updated the self host package description.

#2384
sample to test pending callbacks
test SendToUser
Re-add obsolete OwinExtensions: MapHubs and MapConnection

#2242
Re-added a SystemWeb package to allow for a better update scenario.

- SignalR.Core will fail to update properly if updated individually.

#2242
Fixed test.
Updated copyright.
Re-ordered when we clear private non-timeout based state.

- This way we can successfully reject connection deferrals.

#2189
Added a test to verify when we start->stop->start that all deferred's are rejected or resolved correctly.

#2189