Add search function

[kindraywind]

• [x] Search events from title (closed #25)
• [x] Filter events by upcoming and past events
• [x] Fix hardcode nibname and identifier (closed #2)
• [x] Unit / UI tests

[codecov[bot]]

Codecov Report

Merging #36 into master will decrease coverage by 3.63%. The diff coverage is 31.5%.

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
- Coverage   57.86%   54.23%   -3.64%     
==========================================
  Files          27       28       +1     
  Lines        1258     1442     +184     
  Branches       55       60       +5     
==========================================
+ Hits          728      782      +54     
- Misses        529      659     +130     
  Partials        1        1

Impacted Files	Coverage Δ
...ventsCalendar/Views/Cells/EventTableViewCell.swift	100% <ø> (ø)	:arrow_up:
...alendar/ViewControllers/SearchViewController.swift	0% <0%> (ø)	:arrow_up:
...ntsCalendarUITests/SearchViewControllerTests.swift	0% <0%> (ø)
...endar/ViewControllers/CalendarViewController.swift	0% <0%> (ø)	:arrow_up:
...endar/ViewControllers/EventTabViewController.swift	87.75% <100%> (ø)	:arrow_up:
...hEventsCalendarUITests/TabbarControllerTests.swift	100% <100%> (ø)	:arrow_up:
...ndar/ViewControllers/EventFeedViewController.swift	59.64% <100%> (ø)	:arrow_up:
ThaiTechEventsCalendarTests/CalendarAPITests.swift	78.52% <76.92%> (-0.94%)	:arrow_down:
ThaiTechEventsCalendar/Networks/CalendarAPI.swift	90.38% <93.33%> (+1.19%)	:arrow_up:
... and 1 more

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