Updated dec_const to use plot_data and plot_func, added optional return for...

Updated dec_const to use plot_data and plot_func, added optional return for fig and ax objects, updated documentation

src/juobs_plots.jl

@@ -86,7 +86,7 @@ end
       wpm::Union{Dict{String,Vector{Float64}},Nothing} = nothing,
       c::String ="green",
       alpha::Float64=0.25,
-      label::String = "",
+      label::AbstractString = "",
       figs::Union{Tuple{Figure, PyPlot.PyCall.PyObject},Nothing}=nothing,
 It plots the function `f` evaluated at `xdata`through broadcasting. 
 The function assumes that `f` return type is `uwreal` and is called as `f(x)`.
@@ -115,7 +115,7 @@ function plot_func(f::Function, xdata::Vector{T} where T<:Real;
   c::String ="green",
   alpha::Float64=0.25,
   figs::Union{Tuple{Figure, PyPlot.PyCall.PyObject},Nothing}=nothing,
-  label::String = "",
+  label::AbstractString = "",
   kwargs...) 
   fig,ax = isnothing(figs) ? subplots(1) : figs
   y = f.(xdata);