Ruby style fixes

• Updates for Ruby style guide
• Made the 'config' hash an instance variable

Moving test suite to Docker

• Moving test suite to Docker from Webmock and VCR
• More tests
• Bug fixes

Updating for Ruby syntax

• fix bug with aptly_publish.rb - #82
• style guide updates - #81

Version 0.2.4

• Refactor aptly_cli.rb, aptly_file.rb, aptly_load.rb, aptly_misc.rb for Ruby style guide

Version 0.2.3

• Refactor aptly_publish.rb for Ruby Style guide
• Apply fix for publish update #78
• Add publish update test