Add more parameters to the filter_parameters config.

Adds Sentry DSN, Webhooks, Deploy Keys, etc.

Alphabetized the parameters and included line breaks between each parameter. Easier to merge into EE if there are any differences.

This also seems to be the more popular syntax for adding new parameters, from what I can find.

In the future we may want to [increase the specificity of some of these](http://blog.bigbinary.com/2016/03/07/parameter-filtering-enhacement-rails-5.html) once Rails 5 is out. e.g. instead of `:hook`, `"hook.url"` would be just as effective without removing potentially useful information from the logs.

cc: @stanhu 

See merge request !3971