Adds an OpenGamma application for CloudStack environments

OpenGamma cluster is behind a subnet and uses CloudStack's load balancer in place of Nginx.

Also:
* Renames original OpenGammaCluster application to ElasticOpenGammaApplication and adds a ClusteredOpenGammaApplication interface containing ConfigKeys to be shared with CloudStackOpenGammaApplication
* Moved the web cluster factory used by ElasticOpenGammaApplication to OpenGammaClusterFactory, for simple reuse in CloudStack app. 
* Converts pom from dos line endings to unix
* Depends on Brooklyn 0.7.0-SNAPSHOT
* Unsets JAVA_HOME environment variable in install scripts (see 1a92a7c) to avoid clashes with other versions of Java