Build the provide feedback when an error happens

[Chocksy]

If an error happens raven-js has an option to load a provide feedback dialog that we can show to users so they can give us more details about the error.

Things to do:

• create the db structure to store that information
• create the dialog that will be shown by adding view to be served/requested by the raven-js code
• show the message provided by users in the error#show page