Add hopping example

[wbarnha]

Originally based off #349.

[codecov-commenter]

Codecov Report

Base: 94.45% // Head: 94.03% // Decreases project coverage by -0.41% :warning:

Coverage data is based on head (40511a8) compared to base (ecee01b). Patch coverage: 2.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #354      +/-   ##
==========================================
- Coverage   94.45%   94.03%   -0.42%     
==========================================
  Files         102      102              
  Lines       11023    11073      +50     
  Branches     1293     1297       +4     
==========================================
+ Hits        10412    10413       +1     
- Misses        533      582      +49     
  Partials       78       78              

Impacted Files	Coverage Δ
faust/streams.py	88.01% <2.00%> (-8.06%)	:arrow_down:

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