Add api.verify_certificate to allow non-verified ssl connection (enterprise firewall mitm scenarios), by defaults only secured connections are allowed.

Add latest package check, as long as we are in pre-release.

docs/faq.md

@@ -118,7 +118,7 @@ taks = Task.init(project_name, task_name, output_uri="gs://bucket-name/folder")
 ```
 
 **NOTE:** These require configuring the storage credentials in `~/trains.conf`.
-For a more detailed example, see [here](https://github.com/allegroai/trains/blob/master/docs/trains.conf#L51).
+For a more detailed example, see [here](https://github.com/allegroai/trains/blob/master/docs/trains.conf#L55).
 
 
 ## I am training multiple models at the same time, but I only see one of them. What happened? <a name="only-last-model-appears"></a>

docs/trains.conf

@@ -2,8 +2,12 @@
 api {
     # Notice: 'host' is the api server (default port 8008), not the web server.
     host: http://localhost:8008
+
     # Credentials are generated in the webapp, http://localhost:8080/admin
     credentials {"access_key": "EGRTCO8JMSIGI6S39GTP43NFWXDQOW", "secret_key": "x!XTov_G-#vspE*Y(h$Anm&DIc5Ou-F)jsl$PdOyj5wG1&E!Z8"}
+
+    # verify host ssl certificate, set to False only if you have a very good reason
+    verify_certificate: True
 }
 sdk {
     # TRAINS - default SDK configuration