Implement UnassignallCommand

[florenciamartina]

Fixes #102

[codecov-io]

Codecov Report

Merging #115 into master will increase coverage by 1.53%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##             master     #115      +/-   ##
============================================
+ Coverage     72.37%   73.90%   +1.53%     
- Complexity      570      662      +92     
============================================
  Files            95      103       +8     
  Lines          1716     1901     +185     
  Branches        195      220      +25     
============================================
+ Hits           1242     1405     +163     
- Misses          423      431       +8     
- Partials         51       65      +14     

Impacted Files	Coverage Δ	Complexity Δ
.../seedu/address/logic/parser/AddressBookParser.java	81.48% <0.00%> (+1.48%)	18.00 <0.00> (+2.00)
src/main/java/seedu/address/model/AddressBook.java	74.00% <0.00%> (+2.26%)	19.00 <0.00> (+2.00)
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...rc/main/java/seedu/address/ui/PersonListPanel.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...edu/address/logic/commands/UnassignallCommand.java	100.00% <100.00%> (ø)	2.00 <2.00> (?)
...rc/main/java/seedu/address/model/ModelManager.java	90.66% <100.00%> (+0.96%)	32.00 <1.00> (+3.00)
...c/main/java/seedu/address/model/module/Module.java	88.88% <100.00%> (+0.65%)	18.00 <1.00> (-2.00)	⬆️
...a/seedu/address/model/module/UniqueModuleList.java	67.64% <100.00%> (+2.56%)	24.00 <2.00> (+2.00)
...edu/address/logic/parser/FindModCommandParser.java	80.00% <0.00%> (-20.00%)	8.00% <0.00%> (+5.00%)	⬇️
...a/seedu/address/logic/commands/FindModCommand.java	82.60% <0.00%> (-17.40%)	11.00% <0.00%> (+5.00%)	⬇️
... and 25 more

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[justintzuriel]

LGTM