0.1.1

Added:

• Benchmark scripts for speed testing (Note that these run on local files
  currently)
• Numba for median masking, giving a speedup

Changed:

• Most zip_latest nodes have been changed to combine_latest to avoid
  unwanted buffering.
• Use BinnedStatistics`D properties for masking, which reduces recomputation

Removed:

• streamz dep, now the project depends on streamz_ext