Merge pull request #1 from realestateview/master

Merge commits from realestateview fork
Merge pull request #2 from realestateview/master

Merge commits from REV fork
Merge pull request #3 from realestateview/master

Merge doco change from REV fork
Merge pull request #4 from realestateview/master

Merge commits from REV fork
Merge pull request #5 from realestateview/master

Pull request from REV fork
Setting default block size to 8Gb.
ec2-launch was erroneiously looking for a state variable