Properly diff numbers and strings containing numbers (Addresses issue #10)

[ewoudenberg]

Fixed

• Fix bug where numbers and strings were not differentiated (Fixes issue When processing arrays, can't distinguish between numerical and string item which has the "same" value  #10).

Changed

• Update build scripts and npm dependencies.

Added

• Add unit test for issue When processing arrays, can't distinguish between numerical and string item which has the "same" value  #10.