Add MClearCommand

[drake25122000]

Fixes #81

[erinmayg]

Other than a (very) minor mistake, LGTM!

[codecov-io]

Codecov Report

Merging #93 into master will increase coverage by 0.16%.
The diff coverage is 93.33%.

@@             Coverage Diff              @@
##             master      #93      +/-   ##
============================================
+ Coverage     74.58%   74.75%   +0.16%     
- Complexity      562      570       +8     
============================================
  Files            92       93       +1     
  Lines          1645     1660      +15     
  Branches        185      186       +1     
============================================
+ Hits           1227     1241      +14     
- Misses          367      368       +1     
  Partials         51       51              

Impacted Files	Coverage Δ	Complexity Δ
.../seedu/address/logic/parser/AddressBookParser.java	83.33% <0.00%> (-3.63%)	16.00 <0.00> (ø)
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...va/seedu/address/logic/commands/MClearCommand.java	100.00% <100.00%> (ø)	3.00 <3.00> (?)
src/main/java/seedu/address/model/AddressBook.java	76.74% <100.00%> (+1.13%)	17.00 <1.00> (+1.00)
...rc/main/java/seedu/address/model/ModelManager.java	92.30% <100.00%> (+0.37%)	29.00 <2.00> (+2.00)
...a/seedu/address/model/module/UniqueModuleList.java	75.92% <100.00%> (+1.41%)	22.00 <2.00> (+2.00)

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[justintzuriel]

Minor change

[justintzuriel]

LGTM