Do not fatal if `ENV['GETSENTRY']` isn't set
add travis badge

So that we don't break it
Merge pull request #27 from bitzesty/optional-sentry

Do not fatal if `ENV['GETSENTRY']` isn't set
Update Rails
Merge pull request #29 from bitzesty/4.0.5

Update Rails
update gems
[BIS2029] use passenger
update gems