Fixed an issue in regards to deeply sharing an array or hash.
Changed Sereal to Sereal::Decoder and Sereal::Encoder in recommends
section inside Makefile and META files.Revised limitations section in documentation, in regards to not having
IO::FDPass. E.g. Condvar, Handle, and Queue.Added 'end' method to MCE::Shared::Queue.
Updated documentation on dequeue and pending.Bumped MCE dependency to 1.818.