Release notes

- Ability to check certificate chain and signatures of already signed document
- Ability to check signing status of a document after has been sent signing request
- Implement integrity check of documents
- Ability to send message upon sending invitation for signing document 

- Fixed a bug with Leave feedback form not opening on responsive design 
- Fixed a bug with sending verification code via SMS to US and Canada numbers
- Fixed a bug with loading image of a contact if picture is harmed
- Fixed a bug with adding a second email and then deleting your initial email, removes the receivers of emails from the interaction