Implemented a few more functions

[adriankoren]

• range
• identity
• times
• always
• repeat
• prop

Let me know if this is helpful & as I have time I'll add more.

[JustinGuedes]

Hey thanks! We’ve been wanting to get this project going again. Also we’re planning on moving each function to its own file like we previously had.

[adriankoren]

Hi! Thanks for the approval. At the moment TravisCI is reporting a build failure:

/Users/travis/build/FunctioningFunctionalist/ramda.swift/Ramda/R.swift:464:16: use of unresolved identifier 'curry'
        return curry(times)(functor)

I worked around this locally by adding R.curry.swift to the project file. I can add that change to this PR, but I don't want to mess with the project file like that unless you confirm that this is the right fix!

[TYRONEMICHAEL]

Thanks for this. @JustinGuedes and I are looking to complete this project and would appreciate your help as well.