Encrypt personal information

[adrienpoly]

Before releasing the sign in by Github I think we should encrypt the personal information:

User

• email
• name (doesn't exist yet but I think we should add it as we have the info from Github and remove the current first_name last_name)

ConnectedAccount

• username
• access_token

those are not government secrets but as it is so easy to use encrypted attribute in Rails now I think it would be safer

[adrienpoly]

done