Legendre delay network

[arvoelke]

LegendreDelay version of PadeDelay and legendre=True flag to RollingWindow (defaults to False). Also sets the stage for #160.

Misc:

• Dropped support for nengo<=2.1.1

TODO:

• Include in documentation and build
• Include in CHANGES

[codecov-io]

Codecov Report

Merging #161 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #161   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          30     30           
  Lines        1431   1442   +11     
  Branches      165    166    +1     
=====================================
+ Hits         1431   1442   +11

Impacted Files	Coverage Δ
nengolib/monkeypatch.py	100% <ø> (ø)	⬆️
nengolib/network.py	100% <ø> (ø)	⬆️
nengolib/temporal.py	100% <100%> (ø)	⬆️
nengolib/solvers.py	100% <100%> (ø)	⬆️
nengolib/neurons.py	100% <100%> (ø)	⬆️
nengolib/synapses/analog.py	100% <100%> (ø)	⬆️
nengolib/networks/rolling_window.py	100% <100%> (ø)	⬆️

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