Release 0.8.5-beta

• all: sort imports and cleanup
• lib: add SentryIgnoredException, to easily ignore exceptions from sentry
• providers/saml: add POST binding support to Metadata
• providers/saml: change default NameID Format to emailAddress
• providers/saml: cleanup encoding
• providers/saml: Show error message when trying to get metadata without assigning application
• root: use different cookie names for dev instance
• sources/saml: entity_id -> issuer
• sources/saml: fix build_full_url using incorrect URL parameter
• sources/saml: fix Metadata cert including PEM header
• sources/saml: validate SAMLResponse signature
• ui: don't remove dashes when auto generating slug