Removed DialogHeader which was problematic in Qt 5.2

DialogHeader removed as a workaround for the issues introduced in
SailfishOS Uitukka (1.1.0.38) Qt 5.2 update. Longer term solution
might be to push dialog as separate page in the pageStack only when necessary.
Fixed time parsing in ResultPage's cover after Qt 5.2

After the Qt 5.2 update Javascript Date.toString() returns a bit different
string so added a more appropriate way to concatenate times showed on
app cover.
Bumbed version number and updated Changelog