Unified binding
Add type:'output' to binding
Rename widget_div to widget_html
Merge pull request #1 from jcheng5/unify-bindings

Unified binding
move knob.js and knob.yaml to inst/htmlwidgets.
update knob R functions to be in sync with refactor/remove-s3-methods branch of htmlwidgets.
update knobOutput and renderKnob to new spec based on feature/shiny-function-delegation
htmlwidgets package does not need to be loaded explicitly anymore.
update version number
tweak knob signature, don't exoprt knob_html
move lib directory underneath htmlwidgets
namespace qualify calls to htmlwidgets and htmltools
handle sizing and change the knob default arguments
value precedes min and max
make the knob readOnly
tweak link back to htmlwidgets package
add JJA as author
Fix broken resizing in Shiny