Adding a tool to left-align indels

[nh13]

[codecov-io]

Codecov Report

Merging #539 into master will increase coverage by 0.07%. The diff coverage is 97.67%.

@@            Coverage Diff             @@
##           master     #539      +/-   ##
==========================================
+ Coverage   95.06%   95.13%   +0.07%     
==========================================
  Files         102      103       +1     
  Lines        5790     5918     +128     
  Branches      379      398      +19     
==========================================
+ Hits         5504     5630     +126     
- Misses        286      288       +2

Impacted Files	Coverage Δ
...ain/scala/com/fulcrumgenomics/util/Sequences.scala	77.45% <100%> (+0.22%)	:arrow_up:
.../scala/com/fulcrumgenomics/bam/api/SamRecord.scala	86.99% <80%> (+0.43%)	:arrow_up:
...cala/com/fulcrumgenomics/bam/LeftAlignIndels.scala	98.37% <98.37%> (ø)

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[nh13]

@tfenne can you review this when you get the chance? I'd like to fixup based on @sstadick's comments