Allow using a 4 tuple of min, max, step, value for interact

[jsignell]

Fixes #333

Allows step to be None

[philippjfr]

Looks good to me. Ready to merge?

[jsignell]

I was adding a cell to the interact notebook. Think it's necessary?

[jbednar]

Yes, please do, because this is functionality beyond what ipywidgets supports and thus won't be expected by many people.

[codecov-io]

Codecov Report

Merging #334 into master will increase coverage by 0.05%.
The diff coverage is 95.55%.

@@            Coverage Diff             @@
##           master     #334      +/-   ##
==========================================
+ Coverage   89.42%   89.47%   +0.05%     
==========================================
  Files          85       85              
  Lines        6828     6872      +44     
==========================================
+ Hits         6106     6149      +43     
- Misses        722      723       +1

Impacted Files	Coverage Δ
panel/tests/test_interact.py	100% <100%> (ø)	⬆️
panel/interact.py	76.07% <87.5%> (+0.97%)	⬆️

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[jsignell]

I did a little formatting cleanup in the options table and cleaned up the notebook state.

Before

After

[jsignell]

I'm ready for this to go in now.

[jbednar]

That all looks good. I assume it's deliberate to remove the jupyter-widgets state from Interact.ipynb? Nice to get all that out of there, as long as it's not needed for something.

[philippjfr]

Definitely not needed, I think the jq based script ignores it or I was lazy about clearing it.