makefile in ch02-ch07

1. I add makefile in ch02-ch07
2. I modify the file ch07/ex7_03.cpp ,because the include header is an error! It's ex7_02.h ,not ex7_2.h.
3. I modify the file ch06/ex6_51.cpp ,because in the source code , the first line of main function is a show for error ,so
    I need note it to complete automation completation!
![picture1](https://cloud.githubusercontent.com/assets/6214861/5577147/9ec5b61a-9045-11e4-9bc5-19210801926a.png)
![picture2](https://cloud.githubusercontent.com/assets/6214861/5577152/b2bb4680-9045-11e4-8d8f-f486490ea672.png)
![picture3](https://cloud.githubusercontent.com/assets/6214861/5577154/b5ceeb9c-9045-11e4-8424-18984727cd60.png)
![picture4](https://cloud.githubusercontent.com/assets/6214861/5577156/b8a83d1e-9045-11e4-9062-771bf25788f7.png)
![picture5](https://cloud.githubusercontent.com/assets/6214861/5577158/bb81abc4-9045-11e4-83c9-2b7e7b6ff48a.png)
![picture6](https://cloud.githubusercontent.com/assets/6214861/5577160/bee0479e-9045-11e4-8fc5-fcdb02e808ac.png)
![picture7](https://cloud.githubusercontent.com/assets/6214861/5577174/136b223e-9046-11e4-953a-172de5791aa7.png)
![picture8](https://cloud.githubusercontent.com/assets/6214861/5577177/16e65e06-9046-11e4-8614-ba33727e1e23.png)