Match double digit version numbers 

This patch match 2.4.10 version numbers. Correctly download OpenCV 2.4.10 double digit version numbers 

```sh 

 ./get_latest_version_download_file.sh 
Spider mode enabled. Check if remote file exists.
--2014-10-23 20:26:43--  http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.4.1/opencv-2.4.1.tar.gz/download
Resolving sourceforge.net (sourceforge.net)... 216.34.181.60
Connecting to sourceforge.net (sourceforge.net)|216.34.181.60|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
Remote file does not exist -- broken link!!!

Spider mode enabled. Check if remote file exists.
--2014-10-23 20:26:44--  http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.4.1/opencv-2.4.1.zip/download
Resolving sourceforge.net (sourceforge.net)... 216.34.181.60
Connecting to sourceforge.net (sourceforge.net)|216.34.181.60|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
Remote file does not exist -- broken link!!!

Could not find download file on sourceforge page.  Please find the download file for version 2.4.1 at
http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.4.1/ and update this script
```
Merge pull request #35 from arky/patch-1

Match double digit version numbers