Changed state change actions to allow halting the chain

lib/aasm/state.rb

@@ -18,9 +18,11 @@ def ==(state)
 
       def call_action(action, record)
         action = @options[action]
-        action.is_a?(Array) ?
-                action.each {|a| _call_action(a, record)} :
-                _call_action(action, record)
+        catch :halt_aasm_chain do
+          action.is_a?(Array) ?
+          action.each {|a| _call_action(a, record)} :
+          _call_action(action, record)
+        end
       end
 
       def display_name

spec/unit/state_spec.rb

@@ -63,6 +63,17 @@ def new_state(options={})
     state.call_action(:entering, record)
   end
 
+  it "should stop calling actions if one of them raises :halt_aasm_chain" do
+    state = new_state(:entering => [:a, :b, :c])
+
+    record = mock('record')
+    record.should_receive(:a)
+    record.should_receive(:b).and_throw(:halt_aasm_chain)
+    record.should_not_receive(:c)
+
+    state.call_action(:entering, record)
+  end
+
   it 'should call a proc, passing in the record for an action if the action is present' do
     state = new_state(:entering => Proc.new {|r| r.foobar})