Reviving #84

[mschauer]

The documentation for stirlings1 and stirlings2 indicates that they can use BigInts if provided with such as argument. However the existing functions specify n and k arguments to be Int. This patch allows support for BigInt integers without breaking type consistency of return types, and also provides for some memoization, since otherwise the functions, since they are recursive, can be slow when handling very large integers. (@wherrera10 in #84)

[codecov[bot]]

Codecov Report

Base: 96.85% // Head: 96.89% // Increases project coverage by +0.03% :tada:

Coverage data is based on head (55725ed) compared to base (d1b633b). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
+ Coverage   96.85%   96.89%   +0.03%     
==========================================
  Files           7        7              
  Lines         700      708       +8     
==========================================
+ Hits          678      686       +8     
  Misses         22       22              

Impacted Files	Coverage Δ
src/numbers.jl	100.00% <100.00%> (ø)

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