Updated humans to animals in some files

[m0nggh]

Changed references of humans to become animals
Closes #88

[codecov]

Codecov Report

Merging #94 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #94   +/-   ##
=========================================
  Coverage     72.33%   72.33%           
  Complexity      389      389           
=========================================
  Files            69       69           
  Lines          1200     1200           
  Branches        119      119           
=========================================
  Hits            868      868           
  Misses          301      301           
  Partials         31       31           

Impacted Files	Coverage Δ	Complexity Δ
...java/seedu/address/logic/commands/FindCommand.java	100.00% <ø> (ø)	6.00 <0.00> (ø)

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