Lua tests (#158)

* Fix float comparison in tests

* Lua tests

tests/resources/Engine/Lua/LuaCoroutine.lua

@@ -0,0 +1,15 @@
+
+function even (x)
+    coroutine.yield(1)
+end
+
+function odd (x)
+    coroutine.yield(0)
+end
+
+function infinite (x)
+    for i=1,x do
+        if i==3 then coroutine.yield(-1) end
+        if i % 2 == 0 then even(i) else odd(i) end
+    end
+end