Update output streams so we can redirect stdout with only stats to a file.

Previously, input prompts (like username/pwd) were going to stdout, effectively
breaking the tool if used as directed in the instructions.

tools/gh_api.py

@@ -49,10 +49,11 b' def get_auth_token():'
         return token
 
     print("Please enter your github username and password. These are not "
-           "stored, only used to get an oAuth token. You can revoke this at "
-           "any time on Github.")
-    user = input("Username: ")
-    pw = getpass.getpass("Password: ")
+          "stored, only used to get an oAuth token. You can revoke this at "
+          "any time on Github.\n"
+          "Username: ", file=sys.stderr, end='')
+    user = input('')
+    pw = getpass.getpass("Password: ", stream=sys.stderr)
 
     auth_request = {
       "scopes": [
@@ -64,9 +65,10 b' def get_auth_token():'
     }
     response = requests.post('https://api.github.com/authorizations',
                             auth=(user, pw), data=json.dumps(auth_request))
-    if response.status_code == 401 and response.headers.get('X-GitHub-OTP') == 'required; sms':
-        print("Your login API resquest a SMS one time password")
-        sms_pw = getpass.getpass("SMS password: ")
+    if response.status_code == 401 and \
+       response.headers.get('X-GitHub-OTP') == 'required; sms':
+        print("Your login API resquest a SMS one time password", file=sys.stderr)
+        sms_pw = getpass.getpass("SMS password: ", stream=sys.stderr)
         response = requests.post('https://api.github.com/authorizations',
                             auth=(user, pw), 
                             data=json.dumps(auth_request),