A new XPI will be created at http://chnm.gmu.edu/firefoxscholar/download/scholar-dev.xpi after every commit -- once that XPI is installed, it can be updated at any time to the latest build from SVN via the Add-ons window in Firefox
Devs should continue to use 'svn update', naturally -- others who want to switch to the XPIs should be sure to remove the scholar@chnm (or GUID, if already changed as per r78) text file from their Firefox profile directory before installing from the above URL
This system will be adapted for manual (e.g. alpha/beta/production) builds at a later date