Build has snvs_ and indels_annotation_plans
Move sample_name functionality into a base class
Add optional overrides parameter to get_object

Any properties specified in the second hashref
will override property values in the original
params hashref
Add get_class method on plan
Memoize object instead of caching
Add translations hash to plan

This allows us to override certain param values
in filters with a build-specific value at runtime
Merge branch 'updated' into gb_master