Updated spec file#13

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Commits on Mar 1, 2014

Added MessageBoard and message_board_spec
Adam Lowe
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Commits on Mar 3, 2014

Added message_board_spec
Adam Lowe
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Spelling correction on message_board_spec
Adam Lowe
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Commits on Mar 4, 2014

Moved message_board_spec to a spec directory
Adam Lowe
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Commits on May 24, 2014

Added MessageBoard class; conductor passes slow_down to message_board; engineer passes confirm_slow_down to message_board
Adam Lowe
committed
Removed message_board_spec
Adam Lowe
committed
Changed use of mock to double
Adam Lowe
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