Performing the following updates (closes #115, #116 and #117):

[pwittchen]

Performing the following updates (closes #115, #116 and #117):

• updating project dependencies
• adding unit test covering object creation for Preconditions class
• updating sample apps and applying retrolambda

[codecov-io]

Codecov Report

Merging #118 into RxJava2.x will increase coverage by 1.33%. The diff coverage is 100%.

@@              Coverage Diff              @@
##           RxJava2.x     #118      +/-   ##
=============================================
+ Coverage         98%   99.33%   +1.33%     
=============================================
  Files              5        5              
  Lines            150      151       +1     
  Branches          11       11              
=============================================
+ Hits             147      150       +3     
+ Misses             2        0       -2     
  Partials           1        1

Impacted Files	Coverage Δ
...b/pwittchen/prefser/library/rx2/Preconditions.java	100% <100%> (+40%)	:arrow_up:

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