Add OCR Numbers Test Generator

[GKotfis]

This reference #417 issue.

[ErikSchierboom]

@GKotfis May I ask why did you close this PR?

[GKotfis]

I don't know why older commits was added to pull request. Should be only d30d974, a6419ba, 3b049fb, a7e0c6c

[ErikSchierboom]

@GKotfis Ah, okay. You should be able to fix that by selective dropping commits in an interactive rebase. So you do:

git fetch exercism
git rebase -i exercism/master

And then in the interactive rebase window, you can drop commits. Perhaps make a copy branch first? :)

[robkeim]

+1 for making a copy first... my first rebase went wrong and then I got to spend a long time figuring out a bunch of low level git commands and black magic to try to revert my changes :)