Add default for filters and interpreters
Get filters/interpreters from reporter
Reduce duplication in tests
Remove %overrides option to Factory::get_object()

This was a speculative feature that never got used.
Add default for params in Plan::Base
ExpertPlans store adaptor_params instead of params

This reflects the object creation, since expert objects get created
without any params.  Adaptor objects need params, which are listed in
the 'expert' section of the plan file, but are not strictly speaking
expert params.
Make translations an optional arg to Plan::Base->object

This elminates the need for object_with_translations.
Remove old debugging line
Replace 'for $key (%hash)' with 'while' syntax

This should improve the readability.  I only replaced instances where we
utilized both the key and the value inside of the loop.
Merge branch 'master' of github.com:genome/genome into vr_misc
Merge pull request #135 from davidlmorton/vr_misc

Various small refactorings to Variant Reporting