[#58499594] Added the possibility to use multiply JSON library
removed oj from gemspec and add it to Gemfile
moved gem_available method to Lims::Core namespace
Merge pull request #199 from ke4/58499594_add_multiply_json_implementation

[#58499594] Added the possibility to use multiply JSON library
Put to_json and load_json in Helpers module + fixes
Bump version
Require jrjackson gem for jruby env
Merge pull request #200 from llh1/automatically_choose_json_gem

Automatically choose json gem
mannually merged sanger development branch
generate JSON related methods at load time
Merge pull request #202 from ke4/58499594_add_multiply_json_implementation

58499594 add multiply json implementation