Added a get method to Opts to get an Options object

[jlstevens]

Prompted by a stackoverflow question I decide to go ahead and implement the get method on Opts we have previously discussed. It doesn't do anything fancy for container types but does let you specify the option type if you like e.g with points.opts.get('style').

I haven't put too much thought into the name: get was the first thing that came to mind.

[philippjfr]

Looks good, I'd also like to see an optional backend kwarg and proper Google style docstring.

[jlstevens]

I'd also like to see an optional backend kwarg...

Sure.

... and proper Google style docstring.

I did consider it but saw all the other docstrings in that class weren't google style so I opted to be consistent. I guess I can update all the methods of that class to be google style - maybe the trick to update all the docstrings across HoloViews is to work class by class instead of file by file (or method by method).

[philippjfr]

Looks good to me, I'll merge once tests pass.

[jlstevens]

I did consider it but saw all the other docstrings in that class weren't google style so I opted to be consistent.

Little confused as the other docstrings were google style...I must have been looking at the wrong class when I said that!

[philippjfr]

PR builds passed, merging.