Merge branch 'random'
moved Exceptions into sub-package

and also updated references
added a CryptoException and updated Exception-documentation
SecretSharing now throwing ReconstructionExceptions

All SecretSharing schemes are now throwing ReconstructionExceptions when
reconstruction failed.
Also added some unit-tests to check that.
improved Exception-handling

Improved he Exception-handling of the different Secret-Sharing schemes.
(Also added some unit-tests to check if Exceptions are thrown
correctly.)
Merge branch 'master' of https://github.com/Archistar/archistar-smc into exceptions
Merge pull request #9 from efrantar-tgm/exceptions

Exceptions + RandomSource stuff.