Headings are only supported as string (no expressions)

[jadrake75]

if you use an expression like

${ 'table.column.condition'|t}

for heading in a element it will display that as a literal and not the bound/compiled expression. Makes it difficult for supporting i18n labels/headers.

[Charles Pockert]

The plan was to make the whole column header customisable a la #11

I'd appreciate some feedback on the syntax though - I'd like to go with the most intuitive/comfortable syntax

Since the aurelia 0.15 release I'm going to move all this over and change some of the way the whole thing is "bootstrapped", plus I want to move it all over to TypeScript as I'd like to get the benefits of that

Making the compiler also compile the column header strings would be a good idea though :)