add g2.2xlarge EC2 instance size (JCLOUDS-364)
JCLOUDS-331: Changed return type of TemplateBuilder.imageChooser

TemplateBuilderImpl -> TemplateBuilder
Fixing typos in test name
JCLOUDS-352: Drops support for "-incubating" release versions
JCLOUDS-365: ChefSolo should not depend on InstallChefGems