How do I get a T4 template to generate its output on every build? As it is now, it only regenerates it when I make a change to the template.
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Dynamo.AutoTT will do what you need. You can configure it to watch files via a regex or generate on build. It also allows you to specify which T4 templates you want it to trigger.
You can download it from here : https://github.com/MartinF/Dynamo.AutoTT
Just build it, copy the dll and AddIn files into
C:\Users\Documents\Visual Studio 2012\Addins\
and away you go.
If you want to get it going in VS2012 you will need to modify the a Dynamo.AutoTT.AddIn file and set the Version to 11.0 inside the AddIn file;