Revert "Added traces to debug cmd launched"

Pbs: Added side effects to java-opts and failed unit test obscurely:

 Failure/Error: Jonas.new(
     NoMethodError:
       undefined method `<<' for nil:NilClass
     # ./lib/java_buildpack/container/jonas.rb:71:in `release'
     # ./lib/java_buildpack/container/jonas.rb:64:in `compile'
     # ./spec/java_buildpack/container/jonas_spec.rb:141:in `block (3 levels) in <module:Container>'
     # ./spec/java_buildpack/container/jonas_spec.rb:127:in `block (2 levels) in <module:Container>'
Now uses relative path in cmd, and erb converts topology.xml in absolute path.

Hope its not dependent on ruby 2.0
Merge branch 'jonas'