initial JuMPDict rewrite
Merge branch 'indexsets' of github.com:JuliaOpt/JuMP.jl into indexsets

Conflicts:
	src/JuMPDict.jl
Merge branch 'indexsets' of github.com:JuliaOpt/JuMP.jl into indexsets
more JuMPDict
Merge branch 'indexsets' of github.com:JuliaOpt/JuMP.jl into indexsets

Conflicts:
	src/JuMPDict.jl