First working version of capability interfaces

examples/example_capability.py

@@ -0,0 +1,25 @@
+from __future__ import print_function
+
+import capnp
+import example_capability_capnp
+
+class Server:
+    def foo(self, context):
+        context.results.x = str(context.params.i * 5 + 1)
+
+def example_client():
+    loop = capnp.EventLoop()
+
+    client = example_capability_capnp.TestInterface.new_client(Server(), loop)
+    
+    req = client.request('foo')
+    req = client.request('foo2')
+    req.i = 5
+
+    remote = req.send()
+    response = loop.wait_remote(remote)
+
+    print(response.x)
+
+if __name__ == '__main__':
+    example_client()