Add #to_html method

[athityakumar]

As per discussion on SciRuby/daru#405, I think it'd be apt for the the to_html to be added to daru-view rather than in daru or daru-io. Please mirror the changes caused by SciRuby/daru#366 here. 😄

However, if further discussions on the issue tracker end up in a different conclusion, feel free to close this issue. I'm temporarily closing SciRuby/daru-io#39.

[Shekharrajak]

I think to_html must be in daru only.

[zverok]

@Shekharrajak I am not sure it is true. What we are trying to do currently (see SciRuby/daru#405) is cleanup "core" daru of anything except its main purpose. It means, particularly, that:

• all import/export goes to daru-io
• everything related to iruby notebook goes, probably, to daru-view (well, it was not planned initially, but due to your hard efforts 👍, daru-view now targets iruby as well as web, right?..)

#to_html method has no generic value on itself, it is just "representation for iruby" thing, so, I believe Athitya has a point.

[Shekharrajak]

Okay, So we must move the #to_html code and all the .erb files to daru-view .

Using Daru::View::Table.new(df, options={adapter: :googlecharts}).div returns the HTML and JS code for the df generated by adapter :googlecharts .

[zverok]

Just don't hurry up with this task, it should be done only during process of creating daru 1.0 as per SciRuby/daru#405