SequenceIdGenerator - Fix retry bug for NextId

* SequenceIdGenerator - Fix retry bug when calling NextId when cached
ids are used up.  Also now a syncronization failure to get a new Id
range logs the problem as a warning (formerly error) since it will
retry.
* RepeatingWorkerRoleTask - fix Ping task restart logic to recognize new
custom delay added in 1.2.0.
* updated NuGet package to include debug symbols
* Update package dependency references
* Updated documentation