Add 'to_str' key generator to complement 'to_bin'
Add 'to_str' key generator to complement 'to_bin'

basho/basho_bench,mrallen1/basho_bench,fogfish/basho_bench,linearregression/basho_bench,mrallen1/basho_bench,fogfish/basho_bench,basho/basho_bench,GabrielNicolasAvellaneda/basho_bench,linearregression/basho_bench,GabrielNicolasAvellaneda/basho_bench,basho/basho_bench,fogfish/basho_bench,linearregression/basho_bench,mrallen1/basho_bench,GabrielNicolasAvellaneda/basho_bench,linearregression/basho_bench,mrallen1/basho_bench,GabrielNicolasAvellaneda/basho_bench,fogfish/basho_bench,basho/basho_bench,marksteele/basho_bench,marksteele/basho_bench,marksteele/basho_bench,marksteele/basho_bench