requiring 'yaml'
[fix 46819473] use a specific version of Sinatra

The latest version of Sinatra is not compatible
with Lims-Api.
bumping the version to 1.2.0.2.2
added HTTP request/response logging with middleware
[fix #46799349] added error/exception logging
removed accidentally left debugger from the code
[fix #46799349] Moved the logger to a separate class
Merge pull request #135 from ke4/46799349_we_need_to_add_specific_sinatra_logging_to_the_api

added HTTP request/response logging with middleware
Merge pull request #136 from ke4/fix_travis_build

requiring 'yaml' to fix the Travis build
Merge pull request #133 from ke4/46819473_add_specific_sinatra_version_to_gemfile

46819473 add specific sinatra version to gemfile
rebase