Go to http://bitly.com/stravaplus
Requirements You need node package manager and nodejs
node make.js init
This will download required node modules
node make.js dist
This will create dist/ folder. He is used for a release.
node make.js build
This will create zip archive of dist/ folder in builds/StravaPlus_vX.X.X_[date].zip
node make.js clean
This will clean builds/, dist/ and node_modules/ folders