REL: update version number to 1.2.2 for release

Author: matthew-brett

nibabel/info.py

@@ -9,8 +9,8 @@
 _version_major = 1
 _version_minor = 2
 _version_micro = 2
-_version_extra = 'dev'
-#_version_extra = ''
+#_version_extra = 'dev'
+_version_extra = ''
 
 # Format expected by setup.py and doc/source/conf.py: string of form "X.Y.Z"
 __version__ = "%s.%s.%s%s" % (_version_major,