David Suárez

- use rollup as module bundler - generate UMD compatible import in dist

Random spec failures while concurrent building

1

Hi, Running the tests with `make -j4 test` (-jn > 1 will crash I guess), some specs fails randomly: ```bash make[1]: se sale del directorio '/home/deiv/dev/debian/pkgs/crystal/shards/shards-new' dh_auto_test make -j4 test...