Cleanup Source code

[ngiger]

Here we plan the following steps:

• Update gem standard
• Run bundle exec standardrb --fix src ext/*/src config.ru jobs bin to enforce standard ruby formatter for all source files
• Make run_integration_test pass and commit changes.
• Run bundle exec standardrb --fix test ext/*/test spec to enforce standard ruby formatter for all unitttest and watir test files
• Make run_integration_test pass and commit changes.
• Fix robocop warning (e.g. replace and by ||) and prepare for frozen_strings
• Make run_integration_test pass and commit changes.
• migrate from hpricot (development was abandoned in 2012) to nokogiri
• Remove all references to force_encoding, as all strings are now in UTF-8 format (unless specified otherwise)

[ngiger]

Running bundle exec standardrb --fix src ext/*/src config.ru jobs bin 2>&1 | tee src-problems.txt produced the attached file
src-problems.txt which contains 1628 lines

[ngiger]

We should also migrate from hpricot to nokogiri as hpricot development was abandoned in 2012