Add typed arrays

[gullerya]

At the end of a day it is about to add the actual support for a typed arrays and the tests as well

[codecov-commenter]

Codecov Report

Merging #47 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #47   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          471       517   +46     
=========================================
+ Hits           471       517   +46     

Impacted Files	Coverage Δ
dist/object-observer.js	100.00% <100.00%> (ø)

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