Add ref_count and var_count to vaf interpreter
Interpreters also need their params translated
Dbsnp needs result_class defined
Needs to implement requires_experts
bed file for vep needs to be processed and sorted

Since FeatureList.t now calls processed_bed_file with two different sets of
parameters, we need to make sure that the processed bed file gets recalculated
if the parameters are different.  To do this, we calculate a processed_bed_file_name
based on the parameters and cache each processed_bed_file in a hash with the name
as a key
strand and transcript_status not available from vep
Add gmaf filter
Gmaf interpreter
Tumor-only report
Use default empty hash so we can always set new entries
Merge branch 'updated' into gb_master