fix/Minor fixes

[ibelar]

Fixes:

• path delimiter. Change from reserved URL character code '/' to '-' Using reserved character code in URL for path argument cause error when using more than two model hierarchy.
• unable to find exception class
• remove dynamic class property

[codecov[bot]]

Codecov Report

Merging #28 into develop will not change coverage. The diff coverage is 0%.

@@           Coverage Diff           @@
##             develop   #28   +/-   ##
=======================================
  Coverage          0%    0%           
- Complexity        77    78    +1     
=======================================
  Files              2     2           
  Lines            170   172    +2     
=======================================
- Misses           170   172    +2

Impacted Files	Coverage Δ	Complexity Δ
src/MasterCRUD.php	0% <0%> (ø)	60 <4> (+1)	:arrow_up:

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