JuliaOpt/JuMP.jl — pull request #92 by IainNZ (2014-01-31 22:32:33+00:00)
Title: RFC: append! 

@mlubin @joehuchette
I build expressions term-by-term in the robust stuff, and I found myself doing this a couple of times - its a more efficient way of doing

```julia
aff += new_coeff * new_var
```