Refactor addressBookFilePath => studentListFilePath

[erisjacey]

Also enable assertions in build.gradle

[nweiyue]

LGTM!

[codecov-io]

Codecov Report

Merging #120 into master will not change coverage.
The diff coverage is 85.71%.

@@            Coverage Diff            @@
##             master     #120   +/-   ##
=========================================
  Coverage     74.92%   74.92%           
  Complexity      708      708           
=========================================
  Files           112      112           
  Lines          2070     2070           
  Branches        220      220           
=========================================
  Hits           1551     1551           
  Misses          466      466           
  Partials         53       53           

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/atas/commons/core/LogsCenter.java	78.37% <ø> (ø)	10.00 <0.00> (ø)
src/main/java/atas/model/UserPrefs.java	81.57% <85.71%> (ø)	12.00 <2.00> (ø)

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