Update README.md and HACKING.md and resulting yak shave.

sky/tools/skypy/skyserver.py

Index: sky/tools/skypy/skyserver.py
diff --git a/sky/tools/skypy/skyserver.py b/sky/tools/skypy/skyserver.py
index 970437d070322661aaa554bc2fe353a0e3f06977..499d334dbf7835bf0a1113c5b2694a5a03a8a071 100644
--- a/sky/tools/skypy/skyserver.py
+++ b/sky/tools/skypy/skyserver.py
@@ -16,9 +16,8 @@ SKY_ROOT = os.path.dirname(SKY_TOOLS_PATH)
 SRC_ROOT = os.path.dirname(SKY_ROOT)
 
 class SkyServer(object):
-    def __init__(self, port, configuration, root, package_root):
+    def __init__(self, port, root, package_root):
         self.port = port
-        self.configuration = configuration
         self.root = root
         self.package_root = package_root
         self.server = None
@@ -54,9 +53,8 @@ class SkyServer(object):
             os.chmod(self.sky_server_path(), st[stat.ST_MODE] | stat.S_IEXEC)
         server_command = [
             server_path,
-            '-t', self.configuration,
+            '-p', str(self.port),
             self.root,
-            str(self.port),
             self.package_root,
         ]
         self.server = subprocess.Popen(server_command)