Show 'Create Poll' button on Event#show page
* Hide button on Event#new to avoid confusion

https://trello.com/c/2MOJTfHd
Align Yammer group remind button

https://trello.com/c/wi3NpZxF
Remove Draper, move methods into EventHelper

https://trello.com/c/4GzqUQL7
Fix error causing access tokens to be overwritten

* User access tokens were being overwritten when invitations were created
* Issue was the result of creating an instance of YammerUser class with current_user token information
* Remove YammerUser class
* Modify InviteeBuilder and SessionController to update user information as necessary
* Remove all instances of access tokens being set to anything other than response from omniauth
* Add translator class for data coming back from Yammer api
* Add validates uniqueness check for access_token to user model
* Add test and update specs where necessary
* Rename method responsible for merging existing guest accounts with new Yammer user accounts
Add high resolution logo for OG image

https://trello.com/c/pSSeX6dC
Add update activity story when event is updated

https://trello.com/c/edNoi3nx
Align background for groups in Internet Explorer 8+

https://trello.com/c/1Huj2G1w
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