ECDSA seems to be working for signing (not for verifying yet)

I push it just for backup purposes. The current implementation must be considered unstable and not yet released ;-).
ECDSA is finished for Fp ECC (sign and verify)
Finish ECDSA, implement entropy sources for /dev/random and random.org, and a secure PRNG based on block ciphers on CTR mode.

closes #36
closes #33
closes #32
closes #25
Changed random.org and /dev/random entropy sources to generic URL and file entropy sources
Renamed init method of EntropySource and SecureRandom to seed
Implement SHA-256

closes #38
Rolled back previous Salsa20 refactoring to make core function private again
Uncommented traces in entropy source and secure random tests
Implementation of HMAC

closes #39
Implementation of SHA-1

closes #7
KeyFactory interface and tests
Implementation of PBKDF2

closes #40
Implementation of script

closes #31
Renamed AutoReseed secure random to AutoSeed
Registry implementation of last added algorithms plus tests for them
Added scrypt license
Removed NULL block and steam ciphers to avoid mistakes
Renamed KeyFactory as KeyDerivator to be coherent with the future AsymmetricKeyGenerator
AsymmetricKeyGenerator and refactoring of public and private keys to create an API class to hold them
Implementation of ECKeyGenerator and refactoring of ECC stuff

closes #36