Update to Java 7u51
Merge pull request #30 from boxen/java7u51

Update to Java 7u51
Make the update version and download url params

This way, if people roll want to override which version their Boxen
installs, they can do so via hiera or explicit class parameters
Document the two new parameters
Drop Ruby 1.9 hash syntax
Merge pull request #32 from boxen/flexible-versions

Flexible versions
Add JVMCapabilities to allow Eclipse to open

Info.plist.erb is a copy from 1.7.0_51 with versions parameterised and
additional JVMCapabilities added. Should this file change in future JVM
versions it will need to be updated in the templates directory.