ACRA 5.8.0-alpha1

• ACRA goes Kotlin
  Due to upcoming changes in the android gradle plugin (see #810) the default way to configure ACRA changes. Here is an example how it can be configured using kotlin DSL:

        initAcra {
            reportFormat = StringFormat.JSON
            dialog {
                title = "Dialog Title"
                setResText(R.string.dialog_text)
            }
            httpSender { 
                uri = "https://acra.ch/not-a-real-endpoint/report"
                basicAuthLogin = "test"
                basicAuthPassword = "guest"
            }
        }

Documentation will be updated when we reach stable.

• Fix gmail without attachments (#815)