Roll IterativeDelay animator class into Base.

Close #1131.
Fix initialization issue.
Fix numberOfIterations concern.
Fix NaN delay issue.
Merge branch 'develop' into 1131_roll_iterative

Conflicts:
	plottable-dev.d.ts
Remove plottable-dev.d.ts file.
Merge branch '1131_roll_iterative' of https://github.com/palantir/plottable into 1131_roll_iterative

Conflicts:
	plottable-dev.d.ts
Merge pull request #1177 from palantir/1131_roll_iterative

Roll IterativeDelay animator class into Base.