Don't filter example tests based on environment. (#116)

Travis, AppVeyor, and CIBot all fail when there  are breaking
changes between LineSearches and downstream packages, such as Optim,
that are also used in the examples.
Instead of filtering tests based on CI environment, we'll just have to
remember to add the tests back when the most recent downstream
application works.

docs/generate.jl

@@ -1,14 +1,9 @@
 # generate examples
 import Literate
 
-# We shouldn't run the examples that require Optim in Travis/CI,
-# because an update in LineSearches may be breaking with the
-# most recently tagged Optim version.
-if get(ENV, "CI", "") == "true"
-    ONLYSTATIC = ["optim_linesearch.jl", "optim_initialstep.jl"]
-else
-    ONLYSTATIC = ["",]
-end
+# TODO: Remove items from `SKIPFILE` as soon as they run on the latest
+# stable `Optim` (or other dependency)
+ONLYSTATIC = ["optim_linesearch.jl", "optim_initialstep.jl"]
 
 EXAMPLEDIR = joinpath(@__DIR__, "src", "examples")
 GENERATEDDIR = joinpath(@__DIR__, "src", "examples", "generated")

test/examples.jl

@@ -1,12 +1,7 @@
 @testset "Literate examples" begin
-    # We shouldn't run the examples that require Optim in Travis/CI,
-    # because an update in LineSearches may be breaking with the
-    # most recently tagged Optim version.
-    if get(ENV, "CI", "") == "true"
-        SKIPFILE = ["optim_linesearch.jl", "optim_initialstep.jl"]
-    else
-        SKIPFILE = ["",]
-    end
+    # TODO: Remove items from `SKIPFILE` as soon as they run on the latest
+    # stable `Optim` (or other dependency)
+    SKIPFILE = ["optim_linesearch.jl", "optim_initialstep.jl"]
 
     EXAMPLEDIR = joinpath(@__DIR__, "../docs/src/examples")