[Cassandra Wiki] Update of "GettingStarted" by AntonioOgnio

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The "GettingStarted" page has been changed by AntonioOgnio.
The comment on this change is: Explicit mention of current Linux and Mac OS X versions..
http://wiki.apache.org/cassandra/GettingStarted?action=diff&rev1=42&rev2=43

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  Some people running OS X have trouble getting Java 6 to work. If you've kept up with Apple's updates, Java 6 should already be installed (it comes in Mac OS X 10.5 Update 1). Unfortunately, Apple does not default to using it. What you have to do is change your `JAVA_HOME` environment setting to `/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home` and add `/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home/bin` to the beginning of your `PATH`.
  
  And now for the moment of truth, start up Cassandra by invoking `bin/cassandra -f` from the command line<<FootNote(To learn more about controlling the behavior of startup scripts, see RunningCassandra.)>>. The service should start in the foreground and log gratuitously to standard-out. Assuming you don't see messages with scary words like "error", or "fatal", or anything that looks like a Java stack trace, then chances are you've succeeded. To be certain though, take some time to try out the examples in CassandraCli and ThriftInterface before moving on. Also, if you run into problems, Don't Panic, calmly proceed to [[#if_something_goes_wrong|If Something Goes Wrong]].
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+ Users of recent Linux distributions and Mac OS X Snow Leopard should be able to start up Cassandra simply by untarring and invoking `bin/cassandra -f` with root privileges. Snow Leopard ships with Java 1.6.0 and does not require changing the `JAVA_HOME` environment variable or adding any directory to your `PATH`. On Linux just make sure you have a working Java JDK package installed such as the `openjdk-6-jdk` on Ubuntu Lucid Lynx.
  
  == Step 3: Running a cluster ==
  Setting up a Cassandra cluster is ''almost'' as simple as repeating [[#running_a_single_node|Step 2]] for each node in your cluster. There are a few minor exceptions though.