Crpyto algorithms now has a class and an object

The SymmetricAlgorithm trait has been renamed to
SymmetricAlgorithmInstance and a new SymmetricAlgorithm trait was
created. For example the AES object is a SymmetricAlgorithm while the
corrosponding AES class it a SymmetricAlgorithmInstance.
Fix sbt scct:test resource bug

See https://github.com/jimschubert/scct-resources-issue.
Merge branch 'master' into bc