Request: for Crashlyitics , offer to ignore specific exceptions

## What feature would you like to see?
There are some exceptions that I've come to realize that are not my app's fault.
One of them is DeadSystemException (example [here](https://console.firebase.google.com/u/0/project/app-manager-cdf2c/crashlytics/app/android:com.lb.app_manager/issues/56dcefa86d6cef2e95f474c2e1232468?time=last-seven-days&sessionEventKey=5F9CA91F00280001301E8BA3D2C73720_1468013085156509552)) .
I want to deny sending such crashes to Crashlytics, as each time I try to mute, it appears later again as it can occur everywhere in code.

Describe the feature you would like to add, ideally proposing a specific API.
On the website, offer a snippet suggestion to ignore crashes, that we can add to the app, so that it will be avoided.

## How would you use it?
After it offers various suggestions, we will pick what seems to be the best one.

We might have better rules of how to mute on the website too. But seeing how easy it is for Android to produce more of the same one, I don't know if this is possible.