Fix ordering of tasks

Correct the execution order of deep dependency trees.
Fixes #28.

bake/bakefile.py

@@ -472,7 +472,7 @@ class TaskScript(BaseAction):
 
         # Remove duplicates from the list.
         _actions = []
-        for action in actions:
+        for action in reversed(actions):
             if action not in _actions:
                 _actions.append(action)
         actions = _actions

tests/ordering.Bakefile

@@ -0,0 +1,12 @@
+build: build/stage
+
+build/stage: fetch
+    echo Building stage
+
+fetch: fetch/consul fetch/s6-overlay
+
+fetch/consul:
+    echo Fetching consul
+
+fetch/s6-overlay:
+    echo Fetching S6

tests/ordering.bats

@@ -0,0 +1,9 @@
+#!/usr/bin/env bats
+export BAKEFILE=ordering.Bakefile
+
+@test "dependencies are resolved correctly" {
+    run bake
+    [[ "${status}" -eq 0 ]]
+    [[ "${lines[0]}" == *"build…"* ]]
+    [[ "${lines[1]}" == *"fetch/consul, fetch/s6-overlay, fetch, & build/stage."* ]]
+}