Merge pull request #7 from peacedove/master

update sankey data loaded and graph generation method
Merge remote-tracking branch 'upstream/master'
pathVixService: remove duplicate and legacy code
Sankey: clean-up, rearrange and comment code
hide scrollbar
add custom scrollbar control function (not implemented)
Scrollbar: detect scroll position
Merge pull request #8 from peacedove/master

Sankey: clean-up and add comment