Fix scheduler examples;

examples/coroutine.lua

@@ -1,4 +1,5 @@
 local Rx = require 'rx'
+local scheduler = Rx.CooperativeScheduler.create()
 
 -- Cheer someone on using functional reactive programming
 
@@ -8,12 +9,12 @@ local observable = Rx.Observable.fromCoroutine(function()
   end
 
   return 'who do we appreciate'
-end)
+end, scheduler)
 
 observable
   :map(function(value) return value .. '!' end)
   :subscribe(print)
 
 repeat
-  Rx.scheduler:update()
+  scheduler:update()
-until Rx.scheduler:isEmpty()
+until scheduler:isEmpty()

examples/scheduler.lua

@@ -1,15 +1,16 @@
 local Rx = require 'rx'
+local scheduler = Rx.CooperativeScheduler.create()
 local timerResolution = .25
 local function log(message)
-  print('[' .. string.format('%.2f', Rx.scheduler.currentTime) .. '] ' .. message)
+  print('[' .. string.format('%.2f', scheduler.currentTime) .. '] ' .. message)
 end
 
 -- Demonstrate Rx.Scheduler.Cooperative by running some simultaneous cooperative threads.
-Rx.scheduler:schedule(function()
+scheduler:schedule(function()
   log('this is like a setTimeout')
 end, 2)
 
-Rx.scheduler:schedule(function()
+scheduler:schedule(function()
   local i = 1
   while true do
     log('this prints i twice per second: ' .. i)
@@ -18,7 +19,7 @@ Rx.scheduler:schedule(function()
   end
 end)
 
-Rx.scheduler:schedule(function()
+scheduler:schedule(function()
   for i = 1, 3 do
     log('this will print for 3 updates after 1 second')
     coroutine.yield()
@@ -27,5 +28,5 @@ end, 1)
 
 -- Simulate 3 virtual seconds.
 repeat
-  Rx.scheduler:update(timerResolution)
+  scheduler:update(timerResolution)
-until Rx.scheduler.currentTime >= 3
+until scheduler.currentTime >= 3