Extend delete command

[jerrylchong]

fix #125

Extend delete command to accept names, tags and module names as arguments.

Contacts who have the given names, tags, or are in the given modules will be deleted.

[codecov-io]

Codecov Report

Merging #156 into master will increase coverage by 0.71%.
The diff coverage is 70.19%.

@@             Coverage Diff              @@
##             master     #156      +/-   ##
============================================
+ Coverage     50.49%   51.20%   +0.71%     
- Complexity      609      622      +13     
============================================
  Files           119      119              
  Lines          2745     2777      +32     
  Branches        372      391      +19     
============================================
+ Hits           1386     1422      +36     
+ Misses         1207     1190      -17     
- Partials        152      165      +13     

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
.../seedu/address/logic/parser/CopyCommandParser.java	65.62% <33.33%> (+1.56%)	12.00 <0.00> (ø)
...rc/main/java/seedu/address/model/ModelManager.java	54.00% <38.88%> (+4.75%)	35.00 <3.00> (+4.00)
...eedu/address/logic/parser/DeleteCommandParser.java	72.41% <73.68%> (-27.59%)	16.00 <15.00> (+14.00)	⬇️
...va/seedu/address/logic/commands/DeleteCommand.java	86.95% <84.21%> (-5.36%)	10.00 <4.00> (-1.00)
.../seedu/address/logic/commands/AddLabelCommand.java	78.72% <100.00%> (+9.08%)	10.00 <0.00> (-1.00)	⬆️
...eedu/address/logic/commands/ClearLabelCommand.java	76.00% <100.00%> (+14.23%)	7.00 <0.00> (-1.00)	⬆️
...edu/address/logic/commands/DeleteLabelCommand.java	85.71% <100.00%> (+16.26%)	9.00 <0.00> (-1.00)	⬆️
...java/seedu/address/logic/commands/EditCommand.java	95.52% <100.00%> (-0.54%)	13.00 <0.00> (-2.00)
... and 3 more

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[EkamSinghPandher]

LGTM