- Ordering specified in the header did not match the variants and hg19/b37 flexibility was being applied to VCF datasources and inducing a lot of missed annotations.
- Sanitizing funcotations in VCF.
- Implemented lookahead caching and merged with master.
- Added Funcotator test for clinvar and Gencode v28 in hg38
- Added funcotator test to make sure that mixed chr/no-chr GENCODE and datasources would still annotate properly for hg19.
- Eased restrictions so that Gencode v28 would be recognized as a valid gtf
- Added warning so that future versions of Gencode would not fail just based on the version number and warning would be emitted instead (@jonn-smith)
- Altered the lookahead default value to specific for backend.

- Created a class to minimize the number of copies we make of each untarred test reference.