0.6 deprecations

[sbromberger]

This is probably a big job, but:

WARNING: produce is now deprecated. Use Channels for inter-task communication.
Stacktrace:
 [1] depwarn(::String, ::Symbol) at ./deprecated.jl:64
 [2] produce(::Array{Any,1}) at ./deprecated.jl:884
 [3] #producer#27(::Bool, ::Function, ::ParserCombinator.NoCache{String,Int64}, ::ParserCombinator.Seq!) at /Users/seth/.julia/v0.6/ParserCombinator/src/core/parsers.jl:141
 [4] (::ParserCombinator.#kw##producer)(::Array{Any,1}, ::ParserCombinator.#producer, ::ParserCombinator.NoCache{String,Int64}, ::ParserCombinator.Seq!) at ./<missing>:0
 [5] (::ParserCombinator.##29#30{Bool,ParserCombinator.Seq!,ParserCombinator.NoCache{String,Int64}})() at /Users/seth/.julia/v0.6/ParserCombinator/src/core/parsers.jl:171
while loading /Users/seth/.julia/v0.6/LightGraphs/test/persistence/persistence.jl, in expression starting on line 106