adds bigi to benchmarks
Merge pull request #10 from dcousens/addbigi

Adds bigi to benchmarks
lib: add testn impl

Signed-off-by: Fedor Indutny <fedor@indutny.com>
0.12.0
benchmarks: add Yaffle/BigInteger

Signed-off-by: Fedor Indutny <fedor@indutny.com>
benchmarks: a little refactor
lib: add gcd method
0.13.0
wip toarray