Implement Copy Command

[jerrylchong]

fix #128

[codecov-io]

Codecov Report

Merging #155 into master will decrease coverage by 0.19%.
The diff coverage is 45.21%.

@@             Coverage Diff              @@
##             master     #155      +/-   ##
============================================
- Coverage     50.72%   50.52%   -0.20%     
- Complexity      590      608      +18     
============================================
  Files           117      119       +2     
  Lines          2626     2741     +115     
  Branches        343      371      +28     
============================================
+ Hits           1332     1385      +53     
- Misses         1162     1205      +43     
- Partials        132      151      +19     

Impacted Files	Coverage Δ	Complexity Δ
.../seedu/address/logic/commands/AddLabelCommand.java	69.64% <ø> (ø)	11.00 <0.00> (ø)
...edu/address/logic/commands/DeleteLabelCommand.java	69.44% <ø> (ø)	10.00 <0.00> (ø)
.../seedu/address/logic/parser/AddressBookParser.java	87.50% <0.00%> (-3.81%)	15.00 <0.00> (ø)
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
...rc/main/java/seedu/address/model/ModelManager.java	50.00% <0.00%> (-6.04%)	31.00 <0.00> (ø)
...java/seedu/address/logic/commands/CopyCommand.java	23.33% <23.33%> (ø)	3.00 <3.00> (?)
.../seedu/address/logic/parser/CopyCommandParser.java	64.06% <64.06%> (ø)	12.00 <12.00> (?)
...in/java/seedu/address/logic/parser/ParserUtil.java	56.06% <66.66%> (+1.06%)	15.00 <2.00> (+2.00)
... and 1 more

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