tippy 1.0.0

Remove deprecated call_tippy
Use packer for JavaScript
Deprecate tippy_class, with_tippy in favour of tippy_this and tippy respectively.
Removed renderTippy and tippyOutput functions, these were part of the htmlwidget which is useless.
Initial tippy_plot to use plots in tooltips.
Support new themes.
Allow calling methods on tooltips (e.g.: disable, show, hide, etc.)
Allow setting global theme, see #3

tippy 0.1.0

Updated to tippy 3.2.0