Implement an interface for the Applications API

vultron/cmds/applications.py

@@ -0,0 +1,11 @@
+import vultron.cmd
+
+class Applications(vultron.cmd.Command):
+  def init(self):
+    self.needs_api_key = False
+
+  def vultron_list(self):
+    """Display all available applications."""
+
+    apps = self.api.get("applications")
+    return apps["applications"]