general bug-fixes

v0.2.4

• add ##reference=$fasta to vcf header. (#58)
• fix smoove annotate for recent ensembl GFFs which lack transcript features
• fix bug in lumpy_filter for some versions of GCC (arq5x/lumpy-sv#300)
• just report message on weird alignments instead of failing (#68)
• lower lumpy z cutoff from 4 to 2.75. because of distribution of fragment lengths, this does
  not affect much, but does improve sensitivity after duphold-DHFFC filtering slightly.