Add escapeRegExp function

[engfragui]

Addresses #56

[codecov-io]

Codecov Report

Merging #95 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #95      +/-   ##
============================================
+ Coverage     98.87%   98.87%   +<.01%     
- Complexity      206      207       +1     
============================================
  Files             3        3              
  Lines          4187     4189       +2     
  Branches         55       55              
============================================
+ Hits           4140     4142       +2     
  Misses           24       24              
  Partials         23       23

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/strman/Strman.java	86.99% <100%> (+0.07%)	205 <1> (+1)	⬆️

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[arcticicestudio]

👍

[shekhargulati]

@engfragui can you please resolve the conflicts?