Update README.md

use master branch for travis icon [skip ci]
background-image support
Fix compiler warnings
Fix log message filtering

Taking the sizeof a pointer doesn't give you the array length!
first attempt at using mason to install packages
[skip ci]
curl fixes
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ios build system fixes
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don't omit parameter name
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properly detect boost root
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cleanup makefile
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install nvm and node
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add libraries and make configure script more robust
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use ppa for more recent boost
correctly set CC
link boost when the boost variable is set
use glfw3 libs instead of manually linking OpenGL frameworks on OS X
[skip ci]
fix compile warnings
install boost on osx
silence warning; GCC needs this parameter, but Clang says its unused
make gyp generate newer project files

patch from https://groups.google.com/forum/#!msg/gyp-developer/0JiSNtsKc30/xYxQFqRfrTcJ