Clear services functionality

[hanstirtaputra]

No description provided.

[codecov-io]

Codecov Report

Merging #104 into master will decrease coverage by 0.17%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #104      +/-   ##
============================================
- Coverage     45.97%   45.80%   -0.18%     
  Complexity      430      430              
============================================
  Files           115      116       +1     
  Lines          2112     2120       +8     
  Branches        248      248              
============================================
  Hits            971      971              
- Misses         1106     1114       +8     
  Partials         35       35              

Impacted Files	Coverage Δ	Complexity Δ
...ss/logic/commands/service/ClearServiceCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../seedu/address/logic/parser/AddressBookParser.java	64.00% <0.00%> (-2.67%)	12.00 <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	67.94% <0.00%> (-2.72%)	25.00 <0.00> (ø)

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[RuiFengg]

LGTM