Integer division where floating division is correct

[rodc2]

To match the output of the source 0.3.0 javascript, (Hashids method):
if (!this.seps.length || (this.alphabet.length / this.seps.length) > this.sepDiv) {
in C# is:
if ((Separators.Length == 0) || (((double)Alphabet.Length / (double)Separators.Length) > sepDivisor)) ( / is integer division in c# if both sides are integers, but floating division in javascript)
Without this, some combinations of alphabets and separators will yield results which do not match the javascript results.

[maxnachlinger]

Awesome find! Could you write a quick test and kick a pull request our way?