First version of metadata
make all IDs global
Changed array<GAKeyValue> to map<string>.
Removed trailing whitespace.
Fixed default value for 'evidence'.
Merge pull request #141 from jeromekelleher/avro_maps

Change array<GAKeyValue> to map<string>.
Add VCF header representation, update info format
Merge pull request #153 from cassiedoll/variant-headers

Add VCF header representation, update info format
Merge pull request #136 from cassiedoll/metadata

First version of metadata
Adds GAGeneticSex to common