Acknowledge Visual Studio 2013 supports C99
Make histogram smaller with an union
Hide libpng warnings in non-verbose mode
Avoid shadowing variables
Const
Small alignment/sign/type fixes
no SSE2 intrinsics actually used
make icc code faster
increase mse reporting precision with disabled floyd dithering
Braces for MSVC
Check result of find_best_palette()
MSVC-compatible force inline
Merge branch 'master' into msvc

* master:
  MSVC-compatible force inline
  Check result of find_best_palette()
  Braces for MSVC
  increase mse reporting precision with disabled floyd dithering
  make icc code faster
  no SSE2 intrinsics actually used
  Small alignment/sign/type fixes
  Const
  Avoid shadowing variables
  Hide libpng warnings in non-verbose mode
  Make histogram smaller with an union
  Acknowledge Visual Studio 2013 supports C99