Release Features

[timbitz]

• [x] GTF file support
• [x] Extended Documentation
• [x] Testing suite for test/
• [x] Add alignment parameters to whippet-quant.jl
• [x] Change default file output location/name

[timbitz]

GTF support in isoform branch as of 29873a4

[timbitz]

GTF + test/ in #18