Merge branch 'master' of https://github.com/telegramdesktop/tdesktop into dev

MSVC.md

@@ -128,6 +128,7 @@ Open **VS2013 x86 Native Tools Command Prompt.bat** (should be in **\\Program Fi
     PATH="/c/Program Files (x86)/Microsoft Visual Studio 12.0/VC/BIN:$PATH"
 
     cd /d/TBuild/Libraries/ffmpeg-2.6.3
+    pacman -Sy
     pacman -S msys/make
     pacman -S mingw64/mingw-w64-x86_64-opus
     pacman -S diffutils

Telegram/SourceFiles/pspecific_linux.cpp

@@ -1196,6 +1196,7 @@ void psRegisterCustomScheme() {
             s << "Exec=" << escapeShell(cExeDir() + cExeName()) << " -- %u\n";
             s << "Icon=" << icon << "\n";
             s << "Terminal=false\n";
+            s << "StartupWMClass=Telegram";
             s << "Type=Application\n";
             s << "Categories=Network;\n";
             s << "MimeType=application/x-xdg-protocol-tg;x-scheme-handler/tg;\n";