Dataviz index.html: Switch to d3.tip for tooltips, make country dropdown select different data for histogram; change indent default to 2 spaces
Dataviz index.html: Switch to d3.tip for tooltips, make country dropdown select different data for histogram; change indent default to 2 spaces

TODO: Reindent functions, add missing ';'s

FCH808/FCH808.github.io,zhongyuanzhou/FCH808.github.io,FCH808/FCH808.github.io,zhongyuanzhou/FCH808.github.io,FCH808/FCH808.github.io,zhongyuanzhou/FCH808.github.io