Vertical Progress Bar

[erwang01]

Is your feature request related to a problem? Please describe.
I'm trying to create a Vertical Progress Bar (similar to the one provided in the Storage Example except vertical).

Describe the solution you'd like
A Vertical Progress Bar option. Preferably some sort of parameter I can pass into the MultiProgressView constructor.

Describe alternatives you've considered
I know UIKit has the CGAffineTransform(rotationAngle: ) utility to help rotate UI elements however I'm not having much success applying progressView.transform = CGAffineTransform(rotationAngle: CGFloat.pi/2) to the StorageExample. I inserted it into line 110 of StorageExampleViewController.swift

[mac-gallagher]

Hey @erwang01, I am definitely open to adding this feature to the repo! I imagine the implementation is similar to the one in GTProgressBar.

I will try to find some time to work on this but feel free to submit a PR in the meantime.

Mac