To install via Git:
mkdir -p ~/Library/Application\ Support/TextMate/Bundles
cd ~/Library/Application\ Support/TextMate/Bundles
git clone git://github.com/hoggarth/synapse-tmbundle.git "Synapse.tmbundle"
osascript -e 'tell app "TextMate" to reload bundles'
Source can be viewed or forked via GitHub: http://github.com/hoggarth/synapse-tmbundle/tree/master
To install without Git:
mkdir -p ~/Library/Application\ Support/TextMate/Bundles
cd ~/Library/Application\ Support/TextMate/Bundles
wget http://github.com/hoggarth/synapse-tmbundle/tarball/master
tar zxf hoggarth-synapse-tmbundle*.tar.gz
rm hoggarth-synapse-tmbundle*.tar.gz
mv hoggarth-synapse-tmbundle* Synapse.tmbundle
osascript -e 'tell app "TextMate" to reload bundles'