846 - Removing unneeded plot arg in animator

Also typing return of animate to D3.Selection

Close #846.
846 - Removing unneeded plot arg in animator

Also typing return of animate to D3.Selection

Close #846.
Merge branch '846-removeAnimatorPlotArg' of github.com:palantir/plottable into 846-removeAnimatorPlotArg

Conflicts:
	plottable.js
Merge pull request #857 from palantir/846-removeAnimatorPlotArg

846 - Removing unneeded plot arg in animator