Test no longer needs to sleep after opening Window.

[NHDaly]

Speeds up test by removing sleep(5.0).

After #36 was submitted a couple years ago, Window() is synchronous,
so there's no need to sleep() after opening a window in the tests. EDIT: jk; it was never submitted. D:

[NHDaly]

Oh, jk, I guess you do still need to wait.... It's weird, it passes when I run the file from Juno within Atom, but it indeed fails on the command line:

julia> include("test/runtests.jl")
Error During Test
  Test threw an exception of type MethodError
  Expression: @js(w, Math.log(10)) ≈ log(10)
  MethodError: no method matching isapprox(::Dict{String,Any}, ::Float64)
  Closest candidates are:
    isapprox(::Number, ::Number; rtol, atol, nans) at floatfuncs.jl:205
  Stacktrace:
   [1] eval_comparison(::Expr, ::Expr) at ./test.jl:198
   [2] include_from_node1(::String) at ./loading.jl:576
   [3] include(::String) at ./sysimg.jl:14
   [4] eval(::Module, ::Any) at ./boot.jl:235
   [5] eval_user_input(::Any, ::Base.REPL.REPLBackend) at ./REPL.jl:66
   [6] macro expansion at ./REPL.jl:97 [inlined]
   [7] (::Base.REPL.##1#2{Base.REPL.REPLBackend})() at ./event.jl:73
ERROR: LoadError: There was an error during testing
while loading /Users/daly/.julia/v0.6/Blink/test/runtests.jl, in expression starting on line 12

In fact, this seems to still take a few seconds before it works:

julia> w = Window(Blink.@d(:show => false)); @js(w, Math.log(10))
>> Dict{String,Any} with 0 entries

julia> @js(w, Math.log(10))
>> Dict{String,Any} with 0 entries

julia> @js(w, Math.log(10))
>> Dict{String,Any} with 0 entries

julia> @js(w, Math.log(10))
>> Dict{String,Any} with 0 entries

julia> @js(w, Math.log(10))
>> 2.302585092994046

Any idea why this is? Is Window() not actually synchronous? Should we reopen or open a new version of #28?

[NHDaly]

Ah, ok i githubbed badly. It's confusing that there's only Closed and Open issues, not Closed, Open, and Fixed... Oops.

Okay so actually, this PR won't work, of course. Should I reopen an Issue for making opening a Window() synchronous? Is there still interest in that? I could combine it with #108 if we want?