added a config option to init the library synchronously

[deano2390]

this is to guarantee all strings are loaded before the Application.onCreate() method returns

resolves this issue: https://github.com/hamidness/restring/issues/17

[codecov-io]

Codecov Report

Merging #18 into master will decrease coverage by 1.61%. The diff coverage is 31.25%.

@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
- Coverage   73.14%   71.52%   -1.62%     
==========================================
  Files          16       16              
  Lines         417      432      +15     
  Branches       56       57       +1     
==========================================
+ Hits          305      309       +4     
- Misses         66       76      +10     
- Partials       46       47       +1

Impacted Files	Coverage Δ
...tring/src/main/java/com/ice/restring/Restring.java	45.71% <25%> (-7.86%)	:arrow_down:
.../main/java/com/ice/restring/StringsLoaderTask.java	85.71% <33.33%> (-8.74%)	:arrow_down:
...src/main/java/com/ice/restring/RestringConfig.java	61.9% <40%> (-6.85%)	:arrow_down:

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