0.2.0

• Breaking
  • Builder::build*, Husk::into_hive* now return Hive rather than Result<Hive, SpawnError>
  • beekeeper::hive::SpawnError has been removed
  • Hive::grow and Hive::use_all_cores now return Result<usize, Poisoned> rather than usize
  • Hive::num_threads has been renamed Hive::max_workers
• Features
  • Hive now keeps track of spawn results
    • Hive::alive_workers reports the number of worker threads that are currently alive (<= max_workers)
    • Hive::has_dead_workers returns true if the Hive has encountered any errors spawing worker threads
    • Hive::revive_workers attempts to re-spawn any dead worker threads
• Bugfixes
  • Ordered iterators would enter an infinite loop if there were missing indicies