Update available evolutions based on the candy received after a transfer

[YesThatAllen]

When counting candies to evolves, keep in mind that we get one back for every evolve.

eg: if I want to evolve 10 Pidgies in a row, I need 12 for the first, then the one I get back after the evolution, meaning I need only 11 for the next.

10x11+1=111 candies.. as opposed to 10x12=120 candies.

Once I have 23 candies (and at least 2 Pidgey), I can make two Pidgeottos.

Currently, PokeNurse not show that I have two evolutions available until I had 24 candies.

This is also directly related to the conversation at #101

[hacknug]

I think I've fixed it. Let me make sure it's right and I can submit a PR for this.

[vinnymac]

Nice, I think we have a lot more info available then we used to, I am hoping this is just some math we need to do. I'll review the PR if you make one.

[hacknug]

This was just some math, indeed. Was waiting to hear your thoughts on it before the PR. Will try to submit it later today so you can review and maybe @YesThatAllen can confirm it's working as expected.

[YesThatAllen]

Happy to, looking forward to it.

[hacknug]

Here you go #202

[YesThatAllen]

#202 gets the math right in the preview,

36 pidgey need 36*11 = 396 +1 = 397 total. (This is correct.)

However, the Evolves column is still off.

227-1=226/11=20.5= 20 evolves

[hacknug]

My bad. Didn't thought about changing anything else besided those tooltips. Will check it when I get home.