Sync Github repo with WordPress.org repo

git-svn.txt

svn co url-of-svn-repo
cd trunk
rm -rvf * *.* .*
git clone git-repo.git

copy files:
package.json
Gruntfile.js
.gitignore
.gitattributes
.svnignore

svn propset svn:ignore -F .svnignore .

change package.json

npm install
grunt checktextdomain
grunt addtextdomain
grunt makepot

git add .
git c 'Grunt, POT.'
git push

svn add --force .
svn ci -m 'Sync with github.'

(if necessary)
modify readme.txt, {plugin}.php, package.json for new version

cd ..
svn cp trunk tags/{version}
svn ci -m "Tagging {version}."