Save & reload PoiList when needed

[Teester]

Fixes #21: Save and reload the PoiList when the app is killed and restarted

[codecov-io]

Codecov Report

Merging #32 into master will increase coverage by 5.03%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage    46.3%   51.33%   +5.03%     
==========================================
  Files          98       98              
  Lines        1663     1685      +22     
  Branches       68       71       +3     
==========================================
+ Hits          770      865      +95     
+ Misses        868      783      -85     
- Partials       25       37      +12

Impacted Files	Coverage Δ
...a/com/teester/whatsnearby/data/PreferenceList.java	0% <ø> (ø)	:arrow_up:
...hatsnearby/data/location/LocationJobPresenter.java	0% <ø> (ø)	:arrow_up:
...whatsnearby/data/location/LocationJobNotifier.java	0% <0%> (ø)	:arrow_up:
...ester/whatsnearby/questions/QuestionsActivity.java	31.37% <100%> (+31.37%)	:arrow_up:
...ain/java/com/teester/whatsnearby/data/PoiList.java	100% <100%> (ø)	:arrow_up:
...ava/com/teester/whatsnearby/main/MainActivity.java	45.74% <100%> (+45.74%)	:arrow_up:
...eester/whatsnearby/main/MainActivityPresenter.java	61.11% <85.71%> (+3.66%)	:arrow_up:
...ster/whatsnearby/questions/QuestionsPresenter.java	86.11% <88.23%> (-3.18%)	:arrow_down:
... and 2 more

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