Chages to parse.grl

[ShaiberAlon]

1. make parse.grl work with seqnames that have "-" inside them (some proteins have such seqnames)
2. make ";" as the only acceptable separator by default
3. allow users to supply a vector with separator characters

[codecov]

Codecov Report

Merging #33 (57bedfc) into master (6a5a30c) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   74.77%   74.82%   +0.04%     
==========================================
  Files           1        1              
  Lines        1590     1593       +3     
==========================================
+ Hits         1189     1192       +3     
  Misses        401      401              

Impacted Files	Coverage Δ
R/gUtils.R	74.82% <100.00%> (+0.04%)	⬆️

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