Feature/jdk8 comments

[rmichela]

• JDK8 generator generates comments
• Fix type safety warnings in generated code

[codecov]

Codecov Report

Merging #86 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #86   +/-   ##
=========================================
  Coverage     70.84%   70.84%           
  Complexity      240      240           
=========================================
  Files            38       38           
  Lines           909      909           
  Branches         91       91           
=========================================
  Hits            644      644           
  Misses          241      241           
  Partials         24       24

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