Update docs and schema for new config option

doc/04-schema.md

@@ -567,6 +567,9 @@ The following options are supported:
 * **process-timeout:** Defaults to `300`. The duration processes like git clones
   can run before Composer assumes they died out. You may need to make this
   higher if you have a slow connection or huge vendors.
+* **github-protocols:** Defaults to `["git", "https", "http"]`. A list of
+  protocols to use for github.com clones, in priority order. Use this if you are
+  behind a proxy or have somehow bad performances with the git protocol.
 * **notify-on-install:** Defaults to `true`. Composer allows repositories to
   define a notification URL, so that they get notified whenever a package from
   that repository is installed. This option allows you to disable that behaviour.

res/composer-schema.json

@@ -115,6 +115,21 @@
                 "bin-dir": {
                     "type": "string",
                     "description": "The location where all binaries are linked, defaults to \"vendor/bin\"."
+                },
+                "process-timeout": {
+                    "type": "integer",
+                    "description": "The timeout in seconds for process executions, defaults to 300 (5mins)."
+                },
+                "notify-on-install": {
+                    "type": "boolean",
+                    "description": "Composer allows repositories to define a notification URL, so that they get notified whenever a package from that repository is installed. This option allows you to disable that behaviour, defaults to true."
+                },
+                "github-protocols": {
+                    "type": "array",
+                    "description": "A list of protocols to use for github.com clones, in priority order, defaults to [\"git\", \"https\", \"http\"].",
+                    "items": {
+                        "type": "string"
+                    }
                 }
             }
         },