Added tarball of 1.1 sstables
1.1 now uses sstables to load

This will allow us to use the python driver,
and avoiding loading data via thrift
Ignore untarred sstables
Tarfile module replace system tar
Commented 1.1 changes
Added instructions for tarball
Merge pull request #70 from riptano/upgrade_with_sstableloader

Setup 1.1 in upgrade tests using sstableloader