Remove Email field

[m0nggh]

Removed the email field for animals without new functionalities added yet. Made minor changes to id and species references. Closes #52

[codecov]

Codecov Report

Merging #68 into master will decrease coverage by 0.62%.
The diff coverage is 91.66%.

@@             Coverage Diff              @@
##             master      #68      +/-   ##
============================================
- Coverage     72.42%   71.79%   -0.63%     
+ Complexity      402      388      -14     
============================================
  Files            70       69       -1     
  Lines          1233     1195      -38     
  Branches        126      119       -7     
============================================
- Hits            893      858      -35     
+ Misses          308      306       -2     
+ Partials         32       31       -1     

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/seedu/address/logic/parser/CliSyntax.java	80.00% <ø> (-3.34%)	1.00 <0.00> (ø)
...in/java/seedu/address/logic/parser/ParserUtil.java	96.77% <ø> (-0.45%)	12.00 <0.00> (-2.00)
.../java/seedu/address/model/util/SampleDataUtil.java	20.00% <ø> (ø)	1.00 <0.00> (ø)
src/main/java/seedu/address/ui/AnimalCard.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...c/main/java/seedu/address/model/animal/Animal.java	97.22% <75.00%> (-0.34%)	18.00 <0.00> (-3.00)
.../java/seedu/address/logic/commands/AddCommand.java	100.00% <100.00%> (ø)	8.00 <1.00> (ø)
...java/seedu/address/logic/commands/EditCommand.java	96.72% <100.00%> (-0.30%)	12.00 <0.00> (ø)
...a/seedu/address/logic/parser/AddCommandParser.java	100.00% <100.00%> (ø)	5.00 <0.00> (ø)
.../seedu/address/logic/parser/EditCommandParser.java	91.66% <100.00%> (-0.65%)	10.00 <0.00> (-1.00)
.../java/seedu/address/storage/JsonAdaptedAnimal.java	100.00% <100.00%> (ø)	9.00 <0.00> (-2.00)

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