Filter command

[joelgoh1]

Filters by timeslots
Closes #50

[codecov]

Codecov Report

Attention: Patch coverage is 83.11258% with 51 lines in your changes are missing coverage. Please review.

Project coverage is 76.11%. Comparing base (305fe23) to head (90dccd2).

Files	Patch %	Lines
...c/main/java/seedu/address/ui/StudentListPanel.java	0.00%	12 Missing ⚠️
.../java/seedu/address/model/util/SampleDataUtil.java	10.00%	9 Missing ⚠️
src/main/java/seedu/address/ui/StudentCard.java	0.00%	9 Missing ⚠️
...seedu/address/model/student/UniqueStudentList.java	86.95%	4 Missing and 2 partials ⚠️
.../java/seedu/address/model/timeslots/Timeslots.java	71.42%	2 Missing and 2 partials ⚠️
src/main/java/seedu/address/ui/MainWindow.java	0.00%	3 Missing ⚠️
...main/java/seedu/address/model/student/Student.java	88.88%	1 Missing and 1 partial ⚠️
...el/student/TimeslotsContainsKeywordsPredicate.java	84.61%	1 Missing and 1 partial ⚠️
...java/seedu/address/logic/commands/EditCommand.java	97.29%	0 Missing and 1 partial ⚠️
.../seedu/address/logic/parser/EditCommandParser.java	92.85%	0 Missing and 1 partial ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #54      +/-   ##
============================================
+ Coverage     75.15%   76.11%   +0.95%     
- Complexity      435      454      +19     
============================================
  Files            73       76       +3     
  Lines          1413     1453      +40     
  Branches        137      141       +4     
============================================
+ Hits           1062     1106      +44     
+ Misses          314      309       -5     
- Partials         37       38       +1     

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[yap-zong-xin]

LGTM!