remember directory opened last time

```
Add a patch file 
1. remember directory opened last time.  
2. .h file highlight.
3. fix text file display with html labels. 


```

Original issue reported on code.google.com by `shirosh...@gmail.com` on 9 Apr 2012 at 10:34

Attachments:
- [dir.patch](https://storage.googleapis.com/google-code-attachments/android-codepad/issue-4/comment-0/dir.patch)
