Add several files to .gitignore.

These files are created when using msysgit and git-cl on Windows.

R=cmp@chromium.org
BUG=
TEST=


Review URL: https://chromiumcodereview.appspot.com/10440016

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@138872 0039d316-1c4b-4281-b951-d872f2087c98

.gitignore

@@ -11,6 +11,12 @@
 /svn
 /svn.bat
 /svnversion.bat
+/.codereview_upload_cookies
+/.gitconfig
+/.git_cl_description_backup
+/.last_codereview_email_address
+/.ssh
+/.subversion
 
 # Ignore locations where third-party tools are placed during bootstrapping.
 /python_bin