Spec for the --silent and --output-dataset for the call command

features/call-output-dataset.feature.md

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+# Feature: Call Platfrom Actor and output default dataset
+
+- As a user of a Platform Actor
+- I want run a Platfotm Actor and wait for its results
+- In order to integrate it with other unix-like CLI tools
+
+## Background:
+
+- Given I'm logged in to Apify as a regular user
+- And there's `netmilk/actor-echo` actor available in the store
+- And the Actor implementation doesn't throw itself
+
+## Rule: I can run Actor and output its dataset in one command
+
+### Example: Using the `actor call` with the `--output-dataset` flag
+
+- When I run:
+  ```
+  $ apify call netmilk/actor-echo --input='{"input":{"foo":"bar"}}' --output-dataset
+  ```
+- Then the stdout output contains JSON:
+  ```
+  [{"foo": "bar"}]
+  ```
+- And the exit status code is `0`

features/call-silent.feature.md

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+# Feature: Call Platfrom Actor
+
+- As a CLI user of a Platform Actor
+- I don't want the stdout to be pulluted with the Actor's logs
+- In order to integrate it with other unix-like CLI tools
+
+## Background:
+
+- Given I'm logged in to Apify as a regular user
+- And there's `netmilk/actor-echo` actor available in the store
+- And the Actor implementation doesn't throw itself
+
+## Rule: I can supress the Actor's log
+
+### Example: Using the `actor call` with the `--silent` flag
+
+- When I run:
+  ```
+  $ apify call netmilk/actor-echo --silent --input='{"foo":"bar"}'
+  ```
+- Then the the stdout is empty
+- And the exit status code is `0`