Try with
Hogan.compile(text, {delimiters: '<% %>'});
so you can change the delimeters Hogan uses by passing the compile method an option overriding them.
http://comments.gmane.org/gmane.comp.lang.javascript.express/1426
NB
imo using a template system is useless using angularjs because of https://stackoverflow.com/a/20270422/356380