Improve detection of OS in OsTasks

Confirmed that OSs in EC2 live test return sensible values
Fix EC2 live test and always show 'unknown' when OsTask input empty.
Add note to handlebars-1.0.rc.1.js about why updating it is difficult.
Adds documentation for driver copyResource and copyTemplate methods
Merge pull request #1154 from sjcorbett/further-os-details

Improves detection of OS in OsTasks