refactor - add ShortURLs to SiteTree

[jsirish]

No description provided.

[codecov]

Codecov Report

Merging #8 into master will decrease coverage by 9.08%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master       #8      +/-   ##
============================================
- Coverage     86.27%   77.19%   -9.09%     
- Complexity        9       11       +2     
============================================
  Files             1        2       +1     
  Lines            51       57       +6     
============================================
  Hits             44       44              
- Misses            7       13       +6

Impacted Files	Coverage Δ	Complexity Δ
src/ORM/SiteTreeDataExtension.php	0% <0%> (ø)	2 <2> (?)

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