Decouple project home from jmeter-ec2 code.

This makes it easier to have one instance of jmeter-ec2 on your machine, but
store multiple test setups in different places.

Also, auto detect $LOCAL_HOME and $project and remove unneeded executable
permission on *.properties files.
Merge branch 'master' of https://github.com/oliverlloyd/jmeter-ec2