requires in nested files are not followed

[rjharmon]

1. Have a directory with a bunch of various js files, a subset of which are relevant for a particular .html application-root
2. in my_subset.js, //= require foo.js
3. in foo.js, //= require bar.js
4. use gulp.src("*/.js") and cog("my_subset.js") in gulpfile

Result: bar.js is not expanded, and its content is not available
Expected: contents of bar.js and its requires should arrive in the output

[coen-hyde]

Yeah. Cog can't do nested includes yet.