Merge branch 'master' of https://github.com/supertuxkart/stk-code into ScriptEngine

src/achievements/achievements_status.cpp

@@ -147,7 +147,7 @@ void AchievementsStatus::sync(const std::vector<uint32_t> & achieved_ids)
 
     if(ids.size()>0)
     {
-        ids.pop_back();   // delete the last "," in the string
+        ids = ids.substr(0, ids.size() - 1); // delete the last "," in the string
         Log::info("Achievements", "Synching achievement %d to server.",
                   ids.c_str());
         Online::HTTPRequest * request = new Online::HTTPRequest(true, 2);