Fix ClassFinder for paths containint '+'

[magicDGS]

Fixes #113

[codecov-io]

Codecov Report

Merging #114 into master will increase coverage by 0.02%.
The diff coverage is 40%.

@@             Coverage Diff              @@
##             master     #114      +/-   ##
============================================
+ Coverage     75.69%   75.72%   +0.02%     
  Complexity      580      580              
============================================
  Files            22       22              
  Lines          2181     2183       +2     
  Branches        449      448       -1     
============================================
+ Hits           1651     1653       +2     
- Misses          351      352       +1     
+ Partials        179      178       -1

Impacted Files	Coverage Δ	Complexity Δ
.../broadinstitute/barclay/argparser/ClassFinder.java	41.89% <40%> (+1.61%)	9 <0> (ø)	⬇️

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