Corrected a tiny typo inside GetStarted.md
Added back the profile specific for OS X when JDK6 is in use

Indeed we need a JDK6 specific profile on OS X as there we have to deal
with classes.jar instead of tools.jar . However renamed the profile
from ‘mac-profile’ to ‘mac-jdk6-profile’. This profile was removed by
one of my previous pull requests.
Merge pull request #889 from bvahdat/master

Corrected a tiny typo inside GetStarted.md