moved nuspec file to the project folder
prepared for appveyor
finished implementation of appveyor build process and nuget auto deployment
fixed appveyor.yml
removed duplicated assemblyconfiguration attribute
all warnings are now treated as errors
removed sample projects from solution and updated references
added some unittests
fixed duplicate key exception
implemented all necessary tests
changed async call to sync call
fixed copyright char displayproblem
build process is adding nuget deps automatically to nuspec
Extract TypedHubOneWayProxy

Extract Call methods into independent entity to allow creation
of TypedHubProxy's with different server->client events handling.
Don't use Reflection in TypedHubProxy creation

1) There is no need to access the private _hubs field in HubConnection,
standard CreateHubProxy already use it to provide cached proxy for the
consumer.
2) There is no need to create TypedHubProxy instance through the
reflection.
ObservableHubProxy

Added ObservableHubProxy with ability to treat server->client
event as IObservable<T> streams.