Model attendance

[ruixuantan]

Resolves #117

[codecov-io]

Codecov Report

Merging #118 into master will increase coverage by 0.58%.
The diff coverage is 85.52%.

@@             Coverage Diff              @@
##             master     #118      +/-   ##
============================================
+ Coverage     77.59%   78.18%   +0.58%     
- Complexity      693      745      +52     
============================================
  Files           113      120       +7     
  Lines          1973     2063      +90     
  Branches        206      214       +8     
============================================
+ Hits           1531     1613      +82     
- Misses          397      404       +7     
- Partials         45       46       +1     

Impacted Files	Coverage Δ	Complexity Δ
...dance/exceptions/DuplicateAttendanceException.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...eedu/address/model/lesson/NumberOfOccurrences.java	81.81% <0.00%> (+1.81%)	10.00 <0.00> (+1.00)
...main/java/seedu/address/model/attendance/Week.java	71.42% <71.42%> (ø)	9.00 <9.00> (?)
...ava/seedu/address/model/attendance/Attendance.java	81.81% <81.81%> (ø)	10.00 <10.00> (?)
...edu/address/model/attendance/AttendanceRecord.java	93.33% <93.33%> (ø)	9.00 <9.00> (?)
...address/model/attendance/AttendanceRecordList.java	95.23% <95.23%> (ø)	13.00 <13.00> (?)
...ava/seedu/address/commons/util/CollectionUtil.java	94.44% <100.00%> (+6.94%)	9.00 <4.00> (+4.00)
...ndance/exceptions/AttendanceNotFoundException.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
...el/attendance/exceptions/InvalidWeekException.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
...a/seedu/address/model/moduleclass/ModuleClass.java	100.00% <0.00%> (ø)	17.00% <0.00%> (+2.00%)
... and 16 more

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[dextertanyj]

Great work!

Though, I think it would be best to further decouple the logic and model parts of the house for attendances.

[ypinhsuan]

Looks great!

[dextertanyj]

Just some thoughts and suggestions to improve the defensiveness of the code.

[dextertanyj]

Nice work! LGTM, just some minor suggestions.