added annotation options

src/components.jl

@@ -131,6 +131,7 @@ immutable PlotText
   str::@compat(AbstractString)
   font::Font
 end
+PlotText(str) = PlotText(string(str), font())
 
 function text(str, args...)
   PlotText(string(str), font(args...))
@@ -268,7 +269,7 @@ end
   end
 
   Base.mean(x::Real, y::Real) = 0.5*(x+y)
-  Base.mean{N,T<:Real}(p::FixedSizeArrays.Vec{N,T}, q::FixedSizeArrays.Vec{N,T}) = 0.5 * (p + q)
+  Base.mean{N,T<:Real}(ps::FixedSizeArrays.Vec{N,T}...) = sum(ps) / length(ps)
 
   points(curve::BezierCurve, n::Integer = 50) = map(curve, linspace(0,1,n))
 

src/plot.jl

@@ -187,6 +187,7 @@ annotations(::@compat(Void)) = []
 annotations{X,Y,V}(v::AVec{@compat(Tuple{X,Y,V})}) = v
 annotations{X,Y,V}(t::@compat(Tuple{X,Y,V})) = [t]
 annotations(v::AVec{PlotText}) = v
+annotations(v::AVec) = map(PlotText, v)
 annotations(anns) = error("Expecting a tuple (or vector of tuples) for annotations: ",
                        "(x, y, annotation)\n    got: $(typeof(anns))")