@import and stylesheets that are included multiple times feature request #358
Description
In some cases, especially with code bases with a very large number of stylesheets, a certain stylesheet could technically be imported more than once (say for instance stylesheet A imports B and C, B imports D and E, and C imports E and F... notice that E is being imported twice). For development this is handy, as in some situations a page may want to load stylesheet C without the rest of the overhead that comes with stylesheet A. When r.js combines these files, it would be nice if E was only included once in the final version of A.... however, it ends up duplicated in A.
The best implementation of this would be, when a stylesheet is imported more than once, it shows up in the rendered document at the last location only.