v2.1: Deprecation Checklist

[johnnyshields]

This checklist is to track items deprecated in 2.0 that need to be removed in 2.1:

• Remove aliases for Onelogin and XMLSecurity
• Remove certificate_new parameter (make it return NotImplementedError)
• Remove Utils.set_prefix, Utils.uuid, and Utils::UUID_PREFIX
• Remove idp_cert_fingerprint and idp_cert_fingerprint_algorithm
• Remove compress_request/response parameters (make it return NoMethodError)

def encode_raw_saml(compress)
  saml = deflate(saml) if compress
  CGI.escape(encode(saml))
end