Fix the definition of done()

Author: jiahao

src/StochasticProcess.jl

@@ -18,7 +18,7 @@ type AiryProcess{S<:Real, T<:Real} <: StochasticProcess{T}
     beta::S
 end
 
-done{T}(p::StochasticProcess{T}) = false #Processes can always go on forever
+done{T}(p::StochasticProcess{T}, x...) = false #Processes can always go on forever
 
 #######################
 # White noise process #

test/StochasticProcess.jl

@@ -7,16 +7,16 @@ dx = 0.001
 p = WhiteNoiseProcess(dx)
 @test start(p) == nothing
 next(p)
-@test done(p) == false
+@test done(p, S) == false
 
 p = BrownianProcess(dx)
 @test start(p) == 0
 next(p, 0.0)
-@test done(p) == false
+@test done(p, S) == false
 
 p = AiryProcess(dx, 2.0)
 S = start(p)
 @test S == fill(-2/dx^2, 1, 1)
 next(p, S)
-@test done(p) == false
+@test done(p, S) == false