Update com.dubture.symfony.ui/src/com/dubture/symfony/ui/preferences/LibraryEditor.java

Hi !! When i tried to add a custom symfony's distribution i couldn't see my 'tgz' archives .... the '.' is missing before the extension name ...
Merge pull request #140 from sheikhu/patch-1

Update com.dubture.symfony.ui/src/com/dubture/symfony/ui/preferences/Lib...