Create bookend_rna-1.2.1.tar.gz

bookend 1.2.0 update

Finalized setup files for 1.2.0

Changed splice junction evidence decision tree

Hierarchy of splice junction evidence:
1. --reference and --splice files
2. --genome sequence motifs
3. XS and ts tags from BAM/SAM input

Updated User Guide to v1.1.0

Updated User Guide and README for major release v1.0.1

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