Fixes the Log addition to contract events

[danieldietrich]

Fixes #270

See PR #275, especially this review comment.

Note: The issue #364 hinders me to squash the commits.

[codecov]

Codecov Report

Merging #375 into master will increase coverage by 0.03%.
The diff coverage is 90.47%.

@@             Coverage Diff              @@
##             master     #375      +/-   ##
============================================
+ Coverage     76.55%   76.59%   +0.03%     
- Complexity     1612     1616       +4     
============================================
  Files           215      215              
  Lines          5985     5994       +9     
  Branches        947      946       -1     
============================================
+ Hits           4582     4591       +9     
- Misses         1176     1177       +1     
+ Partials        227      226       -1

Impacted Files	Coverage Δ	Complexity Δ
...ava/org/web3j/codegen/SolidityFunctionWrapper.java	97.42% <100%> (ø)	101 <0> (ø)	⬇️
core/src/main/java/org/web3j/tx/Contract.java	77.77% <88.23%> (+2.56%)	44 <6> (+5)	⬆️
...ore/src/main/java/org/web3j/utils/Observables.java	80% <0%> (-4%)	9% <0%> (-1%)

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[iikirilov]

Thanks!