Implement data validation

[cosmopockets]

Could we add some data validation functions such as,
make upper case,
make lower case,
get random double,
get random int?

[mrKappen]

I am on it!

[alxmjo]

@mrKappen Great! Also, if you're new to the repo and want to get your feet wet, a great way to do that is to migrate an algorithm to the new organization scheme, à la #201 and #202. Let me know if you have any questions.

[alxmjo]

This also requires some thought as to what our goals would be regarding validation and how we would want to implement it in the project.

[beardbytes]

I am interested and new to open source

[alxmjo]

Great! Have a look at PR #209. A lot of the work is already done but it was closed automatically a while ago (there were merge issues that were never sorted out).