Remove conversations and RT/fav count in TweetPage

The conversations and RT/fav count are using undocumented API and it is
not working anymore since retirement of API 1.0
Update translations
Bump version to 1.8.2
Add SymbianUtils class and move QMLUtils::minimizeApp() to it
Add global notification to Symbian
Open external url using Symbian default browser
Merge pull request #2 from dicksonleong/master

Update to 1.8.2