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
Merge pull request #3 from jjallaire/master

changes to knob for intro vignette