Implement Sort for flashcards

[minzzelo]

Resolves #71

[codecov-io]

Codecov Report

Merging #95 into master will increase coverage by 0.96%.
The diff coverage is 94.73%.

@@             Coverage Diff              @@
##             master      #95      +/-   ##
============================================
+ Coverage     63.94%   64.90%   +0.96%     
- Complexity      491      511      +20     
============================================
  Files            94       97       +3     
  Lines          1725     1781      +56     
  Branches        190      197       +7     
============================================
+ Hits           1103     1156      +53     
- Misses          550      551       +1     
- Partials         72       74       +2     

Impacted Files	Coverage Δ	Complexity Δ
...du/flashcard/logic/parser/FlashcardDeckParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/seedu/flashcard/model/Model.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
...eedu/flashcard/logic/parser/SortCommandParser.java	85.71% <85.71%> (ø)	5.00 <5.00> (?)
...va/seedu/flashcard/logic/commands/SortCommand.java	100.00% <100.00%> (ø)	7.00 <7.00> (?)
...n/java/seedu/flashcard/logic/parser/CliSyntax.java	88.88% <100.00%> (+1.38%)	1.00 <0.00> (ø)
.../java/seedu/flashcard/logic/parser/ParserUtil.java	95.23% <100.00%> (+0.59%)	22.00 <2.00> (+2.00)
.../main/java/seedu/flashcard/model/ModelManager.java	67.30% <100.00%> (+3.47%)	14.00 <1.00> (+1.00)
.../seedu/flashcard/model/flashcard/SortCriteria.java	100.00% <100.00%> (ø)	5.00 <5.00> (?)
... and 1 more

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[sgn00]

LGTM!