Revert changes to OS X README for 10.6, it does not work anymore.

This reverts commit 6de983bcd8cf12664767fb825fd3d1f910b404c9.
This reverts commit cfba89ffbce1e64e89f55fae8f4881d4473c037a.
Improve the OS X ReadMe
Merge pull request #143 from eregon/osx10.6

Update Mac OS X's ReadMe