Bundle updates
Comment out responsive CSS - doesn't seem to be included in the bootstrap-sass gem
Add secret key to devise config for reasons I don't really understand
Revert "Comment out responsive CSS - doesn't seem to be included in the bootstrap-sass gem"

This reverts commit cba21dbe2dafa766e5e3b459ef664c1d3360381b.
Update for new bootstrap
Tidy up new navbar