Updated userauth functions to not require publickey or private key passphrase. Updated tests, changelog.

Author: Pan

.travis.yml

@@ -68,6 +68,7 @@ jobs:
 
     - stage: build packages
       os: osx
+      osx_image: xcode8.3
       before_install:
         - brew update
       install:

Changelog.rst

@@ -1,6 +1,20 @@
 Change Log
 =============
 
+0.15.0
++++++++
+
+Changes
+--------
+
+* Updated ``session.userauth_publickey*`` functions to make providing public key and private key passphrase optional.
+* SFTP write calls write on all parts of buffer before returning.
+
+Fixes
+------
+
+* ``session.last_error()`` would always return empty string.
+
 0.14.0
 +++++++