Fix for Option Widgets

Cheers to @korsbo

Drop Julia 0.5 Support

Drop Julia 0.5 support.
Various layout and slider fixes by @korsbo
Progress meter fix, and changed to Float64 from Int

Install and Progress Meter Fixes

Check for widgetsnbextension not ipywidgets version in build.jl and allow setting ENV["WIDGETS_VERSION"] = "2.0.0" if all else fails. Should fix lots of the recent install problems.

If widgets don't display, please run Pkg.build("Interact") after upgrading.

windows build fix

Merge pull request #206 from stevengj/betterbuild

try harder to find Jupyter and Python during build

v0.6.3: use new code path from 6.0.0 on

this breaks the least number of setups!

Fixes Ipywidgets 0.6 (widgetsnbextension 2.x) compatibility

• Fixes Ipywidgets 0.6 (widgetsnbextension 2.x) compatibility
• Fixes selection(;multi=true) regression

Fixes Ipywidgets 0.6 (widgetsnbextension 2.x) compatibility

Fixes #178

v0.6.0

support ipywidgets >= 6.0.0

v0.5.0

drop Julia 0.4 support

v0.4.6

some more 0.6 depwarn fixes