Add sys-devel/llvm-3.4 for Darwin, update README.md
Add app-arch/unzip-6.0-r3, update README.md
Add dev-vcs/subversion-1.7.14, update README.md
Add dev-lang/python-2.7.5-r4, update README.md
Add dev-libs/openssl-1.0.1f, update README.md