Move RSA exponent coprimality test to rsa.js.
Add worker-based prime number generation code to prime.js.
Do not overwrite options.prng; ensure loop executes at least once.
Use forge.prime for worker-based RSA keygen.
Release 0.6.6.
Start 0.6.7.
Add docs on prime number generation.
Fix indentation.
Fix heading.
use issuer attributes in IssuerSerial certificate reference
Merge pull request #127 from procilon/upstream

Use issuer attributes in IssuerSerial certificate reference.
Release 0.6.7.
Start 0.6.8.
Merge branch 'master' of git://github.com/lautaroscytl/forge into lautaroscytl-master
Remove extra MGF1 parameters (revert).
Various fixes.

- Add core KDF API and KDF1, KDF2 implementations; use this
  explicitly instead of changing MGF1.
- Fix array/byte/string encodings.
- Remove unused code.
- API changes, use constructor for kdf, use options param, etc.
Style fixes, fix assert param order, remove extra code, compare with hex.
Move RSA-specific KEM under 'rsa' namespace in kem.
Use more specific test descriptions.
Fix formatting.