Fix ALL deprecation warnings on Julia 0.7.0

[Datseris]

I started to do this but I need help. I don't know what I am doing wrong, and haven't really understood what Combinatorics actually does. For now whenever I do [combinations(['a', 'b', 'c'])...] I get:

10-element Array{Array{Char,1},1}:
 ['a']
 ['a']
 ['b']
 ['c']
 ['a', 'b']
 ['a', 'b']
 ['a', 'c']
 ['b', 'c']
 ['a', 'b', 'c']
 ['a', 'b', 'c']

Why is the first element of each "increasing size" become doubled?

[tpoisot]

This is related to #66, right?

[HarrisonGrodin]

Rather than copying the code to a separate method, I believe you could just use Base.iterate(c::Combinations, s = collect(1:c.t)). 🙂

[Datseris]

Thanks!!!! For some reason I don't truly understand this actually fixed the problem!

I'll now carry on with the rest.

[HarrisonGrodin]

No problem! The default state (second argument) of the iterate function is supposed to be the initial iteration state, which is what start previously provided.

[Datseris]

hi!!! I just finished this! Please review and merge as soon as you can! :)

[ararslan]

Superseded by #69. Sorry :/

[Datseris]

Nooooo come on people why didn't you say you were working on it... :(
Well on the bright side I now fully understand the new iterate system! :)

[HarrisonGrodin]

@Datseris Sorry, didn't realize you were trying to update to 0.7 based on previous PR name... should've inferred. 😞 Nicely done, though.