Add web worker support. Load the whole library in a web worker
and make the high-level API accessible from an asynchronous proxy.
Entropy is seeded to worker on each generateKeyPair() call.
Allow serialization of packets and custom types for messaging API.
Unit tests for web worker. Only active for browsers.
Web worker: add entropy estimation
Web worker: add more unit tests
Fix: clear subpackets of symmetrically encrypted packet after encryption
Web worker: unit tests for random buffer and entropy estimation
Web worker: add decryptKey and decryptKeyPacket methods to proxy
Change internal representation of random data from Uint32Array to Uint8Array
Web worker: simplify random data supply
Merge pull request #151 from openpgpjs/worker

Web Worker