relax parseTemplateRef and allow any arbitrary expression (fixes #269)
relax parseTemplateRef and allow any arbitrary expression (fixes #269)

internalfx/nunjucks,punkave/nunjucks,rhengles/nunjucks,oddbird/nunjucks,devoidfury/nunjucks,devoidfury/nunjucks,campbellwmorgan/nunjucks,oddbird/nunjucks,node-modules/nunjucks,vigetlabs/nunjucks,vigetlabs/nunjucks,carljm/nunjucks,node-modules/nunjucks,AaronO/nunjucks,carljm/nunjucks,rhengles/nunjucks,fabien/nunjucks,campbellwmorgan/nunjucks,carljm/nunjucks,amyboyd/nunjucks,pardo/nunjucks,rhengles/nunjucks,punkave/nunjucks,fabien/nunjucks,AaronO/nunjucks,santoshsahoo/nunjucks,kevinschaul/nunjucks,santoshsahoo/nunjucks,pardo/nunjucks,internalfx/nunjucks,amyboyd/nunjucks,robgraeber/nunjucks,oddbird/nunjucks,kevinschaul/nunjucks,node-modules/nunjucks,punkave/nunjucks,popomore/nunjucks,rhengles/nunjucks,kevinschaul/nunjucks,santoshsahoo/nunjucks,robgraeber/nunjucks,fabien/nunjucks,campbellwmorgan/nunjucks,AaronO/nunjucks,fabien/nunjucks,amyboyd/nunjucks,santoshsahoo/nunjucks,punkave/nunjucks,kevinschaul/nunjucks,devoidfury/nunjucks,vigetlabs/nunjucks,atorkhov/nunjucks,robgraeber/nunjucks,internalfx/nunjucks,popomore/nunjucks,vigetlabs/nunjucks,carljm/nunjucks,atorkhov/nunjucks,internalfx/nunjucks,robgraeber/nunjucks,atorkhov/nunjucks,AaronO/nunjucks,pardo/nunjucks,popomore/nunjucks,mozilla/nunjucks,atorkhov/nunjucks,node-modules/nunjucks,campbellwmorgan/nunjucks,oddbird/nunjucks,pardo/nunjucks,mozilla/nunjucks,mozilla/nunjucks,amyboyd/nunjucks