added encrypted assertion files
added encryptedassertion to response
fixed plural encrypted_assertion which caused endless loop
added encrypt_assertion util method
added tests for encrypted assertions and Saml::Util.encrypt_assertion
bumped version
fixed xmlenc dependency
fixed Gemfile.lock
minor refactor
merged with master
Updated typo
fixed small bug when in case no current_provider is set
Merge pull request #25 from digidentity/add-encrypted-assertion

Add encrypted assertion