Merge branch 'release/1.0'
Retrieve master instance AMI ID from parameter.

Windows AMI provided by amazon is not sustinable, because it is
unregistered when the new version is released.
So the AMI-ID of windows instance cannot be written within the template.
support spot instances for slaves.
add parameters to properties file.
Merge branch 'feature/support_spot_instances' into develop
set version label to 1.1
Merge branch 'release/1.1'
Merge branch 'release/1.1' into develop
jmeter tuning
Merge pull request #2 from makotan/spike/slave_tuning

jmeter tuning
set version label to 1.2
Merge branch 'release/1.2'
Merge branch 'release/1.2' into develop
prepare for next development iteration.
set version label to 1.2.1
Merge branch 'hotfix/1.2.1' into develop

Conflicts:
	build.gradle
change JMeter download URL.
set version label to 1.3
Merge branch 'release/1.3' into develop
prepare for next development iteration.