update changelog and authors file

AUTHORS.txt

@@ -18,6 +18,7 @@ David (d1b)
 Dmitry Gladkov
 Donald Stufft
 Francesco
+Gabriel de Perthuis
 Geoffrey Lehée
 Georgi Valkov
 Hugo Lopes Tavares

CHANGES.txt

@@ -4,8 +4,11 @@ Changelog
 1.4.dev1 (unreleased)
 ---------------------
 
-* Fixed a number of issues (#413, #709, #634 and #602) related to cleaning up and
-  not reusing build directories. (Pull #865)
+* Fixed a number of issues (#413, #709, #634, #602, and #939) related to cleaning up and
+  not reusing build directories. (Pull #865, #948)
+* pip will no longer try to install or upgrade Distribute in Python 3. (Pull #937)
+* Added a User Agent so that pip is identifiable in logs. (Pull #901)
+* Added ssl and --user support to get-pip.py. Thanks Gabriel de Perthuis. (Pull #895)
 * Fixed the proxy support, which was broken in pip-1.3. (Pull #840)
 * Fixed issue #32 - pip fails when server does not send content-type header.
   Thanks Hugo Lopes Tavares and Kelsey Hightower (Pull #872).