Mac installation issues

[olegp]

When node -v v0.5.4 & npm -v 1.0.17 are used the following issues were spotted by @dsowsy:

• npm root -g returned an error about using the deprecated require.paths
• NODE_PATH had to be manually added to ~/.bashrc
• fibers and traceur are installed in common-node/node_modules, however running tests gives error saying fibers cannot be found; installing them manually globally fixed this

Please try to reproduce this and comment here on how we could possibly address these issues.