Buyables Tool Tips Update

Added which tier of reset currency each buyable costs, as it is causing
confusion. Many threads in subreddit about it, hopefully this helps.
Abstracted currToGain Algorithm Update

More accurate; sometimes it will drop you short of a positive
currToNext, so I reorganized the flow to finish off the calc with the
iterative version of the algorithm in that case.
Added Statistics for Reset Currency

"Total reset currency gained: 193 (146 by proofs, 47 by mathematicians)"
displayNum to ResetCurr Buyables tooltips

"Unlocks tier 5.<br /> Costs " + displayNum(10, false) + " tier 1 reset
currency."
Revert "Abstracted currToGain Algorithm Update"

This reverts commit 6191eed6e624c18c8d455f459597f352fcee3ed9.
Merge pull request #7 from sloanr333/pull-ready

Pull ready