Implement relative path

[magicDGS]

Closes #12

[codecov-io]

Codecov Report

Merging #59 into master will increase coverage by 3.55%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #59      +/-   ##
============================================
+ Coverage     84.36%   87.92%   +3.55%     
- Complexity      126      144      +18     
============================================
  Files             8        8              
  Lines           339      356      +17     
  Branches         60       64       +4     
============================================
+ Hits            286      313      +27     
+ Misses           42       33       -9     
+ Partials         11       10       -1

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/org/magicdgs/http/jsr203/HttpPath.java	89.72% <100%> (+6.99%)	82 <20> (+18)	⬆️
.../java/org/magicdgs/http/jsr203/HttpFileSystem.java	85.71% <100%> (ø)	18 <0> (ø)	⬇️

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