Fix issues with the new "reverse grand prix" feature and user defined GPs
Fix debug output error for sync object
Use a simpler frag shader for grass shadow
Disable console thread from networking code - not needed atm, and
making this thread safe is not trivial.
Fix travis
Fix release compilation.
Fixed compiler warnings.
Disable 800x600 resolution in release mode (it's useful for debugging,
so I'll keep it in debug mode).
Merge branch 'master' of github.com:supertuxkart/stk-code
Applied patch for #600 (support 64 bit compilation on windows).
Minor code simplification.
Merge branch 'master' of github.com:supertuxkart/stk-code
Added new supertuxkart.appdata file from hughsie (#1545).
Removed more compiler warnings for 64 bit windows compilation.
Fixed line endings.
Fixed warning when SOCKET_ERROR is already defined.
Avoid redeclaration for mingw compiler
Added Screen::push() function to shorten the calls to pushScreen().
Merge branch 'master' of github.com:supertuxkart/stk-code
Fixed warning in cmake 3.0 and above.

If I understand correctly, the COMPILE_DEFINITIONS_DEBUG property is ignored in newer versions of cmake. I fixed it by forcing to use old method.