fix the connection sharing so it works as specified in README

Conflicts:
	lib/queue_classic/setup.rb
add .travis.yml
force the use of new version of minitest
enable connection sharing for workers
add .travis.yml
force the use of new version of minitest
replace Drone badge by Travis' and add it to the top of README
add Code Climate badge
Merge pull request #204 from jipiboily/add-travis

Add travis
Merge pull request #205 from jipiboily/add-code-climate

Add code climate badge
fix coding style error
fix the use of a connection as an argument if it exists
Merge pull request #203 from jipiboily/fix-connection-sharing

Fix connection sharing
Switch require to require_relative

Load a file that is relative to the file requiring.
Circular require is considered harmful
Circular require is considered harmful
Require relative to requiring file's path
Require relative to requiring file's path
Merge pull request #208 from wurde/master

Resolved circular require warnings
add conditional measure output