Morph the addressbook into a library

[Stefan-Jiang]

Spotted errors in UI design and some tests commented out. Create a new intellibrary.log but still keep the original addressbook.log. Fixed #99

[Stefan-Jiang]

LGTM

[codecov-io]

Codecov Report

Merging #112 into master will decrease coverage by 0.13%.
The diff coverage is 58.10%.

@@             Coverage Diff              @@
##             master     #112      +/-   ##
============================================
- Coverage     60.89%   60.76%   -0.14%     
  Complexity      475      475              
============================================
  Files            92       92              
  Lines          1785     1789       +4     
  Branches        236      236              
============================================
  Hits           1087     1087              
  Misses          630      630              
- Partials         68       72       +4     

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/seedu/address/MainApp.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...in/java/seedu/address/commons/core/LogsCenter.java	76.31% <0.00%> (-2.07%)	10.00 <1.00> (ø)
...java/seedu/address/logic/commands/EditCommand.java	93.40% <ø> (ø)	12.00 <0.00> (ø)
...java/seedu/address/logic/commands/ExitCommand.java	33.33% <0.00%> (-66.67%)	2.00 <1.00> (ø)
.../seedu/address/logic/parser/EditCommandParser.java	94.44% <ø> (ø)	15.00 <0.00> (ø)
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
.../java/seedu/address/model/util/SampleDataUtil.java	17.64% <0.00%> (ø)	1.00 <0.00> (ø)
src/main/java/seedu/address/ui/MainWindow.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/seedu/address/ui/UiManager.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...seedu/address/storage/JsonSerializableLibrary.java	53.33% <50.00%> (ø)	2.00 <1.00> (?)
... and 10 more

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