Adding debugger for development
Remove filters in development to help debugging
Close #141

This was a miss when upgrading devise a while back.
Passwords could not be correctly reset before this change because devise
now saves an encoded version of the password in the DB and hands over
the original token. Therefore, the token sent in the email cannot be the
one in the DB.
Styling flash boxes per class and ensuring ids are unique

Rails now returns an array of errors for errors[:key] since one can have
more than one error in a single key. So a flash error can contain an
array of values instead of a single value. Therefore, we iterate over
the contents of a flash value in case it is an array and generate a div
per content with an incremental ID and a class to identify the groups.