Release connectors compatible with IS 6.0.0 and update the connector store

[chamathns]

Describe the issue: With the 6.0.0 release, we need to make sure the connectors are compatible with the product and need to update the connector store accordingly.

[asha15]

These connectors were tested and updated in the connector store:

• Email Notification Handler
• CAS inbound authenticator
• Reddit
• Amazon Authenticator
• LinkedIn Authenticator
• Dropbox authenticator
• Evident Identity Verification
• JWT SSO Inbound Authenticator
• AWS Cognito Authenticator
• Private Key JWT Client Authenticator
• Duo Security authenticator
• Github authenticator
• Bitly authenticator
• Password Policy authenticator
• Nuxeo
• Wordpress
• Yammer
• Basecamp authenticator
• Foursquare authenticator
• MailChimp
• WS-Trust Authenticator
• Pinterest authenticator
• Instagram authenticator