Fix missing include file "SmartLibgit2Ref.h"

needs to be included after git2.h

Signed-off-by: Yue Lin Ho <b8732003@student.nsysu.edu.tw>

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I have a question:
Is Cache project only for Win32, not support x64?

If comment
```
		if (filepath.Find(_T(".git")) >= 0)
			continue;
```
Got this:

![lock](https://cloud.githubusercontent.com/assets/5831804/3506037/9d78565a-066b-11e4-9e5a-17222262620d.png)

Then sets Status cache to NONE, TGitCache.exe is still there.