removed homebrew, simplified with packages for git and node
Update INSTALL_OSX.md

Changed minimum node version requirement to 0.8 as per PR comments
Update INSTALL_OSX.md

Added minimum version 0.10.4 as it is now the min req. Newer modules are now in use, necessitating 0.10.4
Update INSTALL_OSX.md

added newline fix
Merge pull request #30 from aantonop/docs/osx

removed homebrew, simplified with packages for git and node