* Tries to match user account from list of emails in Github API
Requests the 'user:email' scope from Github which returns the private
emails associated with the user's account.
* Centres GitHub button in layout
* added account page showing username and email
* change username and email
* validate current password and add new password
* reject promise with error for reduxForm submit-validation for current password
* updated user reducer to handle setting sucess and server side async
* warning if there is current password but no new password
* fixes logout button
* import validate function, fixes logout style