Ignore swap files generated during file edting by vim

To ignore swap files from getting into repository
currently the implemented ignore is *.swp
however vim adds more swap files if these files exists,
so improving this with .*.sw?

Change-Id: I11965d5fb22aeae622dad8bb29cf1f0533ed439a
Closes-Bug: #1255876

.gitignore

@@ -7,7 +7,7 @@ subunit.log
 cover
 *.pyc
 .idea
-*.swp
+.*.sw?
 *~
 AUTHORS
 ChangeLog

doc/source/index.rst

@@ -35,6 +35,7 @@ MASTER
 .. _1254587: http://bugs.launchpad.net/python-cinderclient/+bug/1254587
 .. _1253142: http://bugs.launchpad.net/python-cinderclient/+bug/1253142
 .. _1252665: http://bugs.launchpad.net/python-cinderclient/+bug/1252665
+.. _1255876: http://bugs.launchpad.net/python-cinderclient/+bug/1255876
 
 1.0.7
 -----