* ^ Upgrade deps to get rid of json 1.8
 also update nokogiri and excon for security
* ^ Bumps net-ssh to 5.2 as tested in #954

* + Modernize travis builds
* ! handle bundle --without no_ci deprecation
* + travis.yml: Bundler caching and parallelism
* ! Ignore vendored gems with rubocop

I do not have plans to work on Backup anymore. When there are people
willing to take over the project I'll leave the project.

Matz is nice and so we are nice

Drop mocha in favour of rspec-mocks, upgrade to rspec 3.8

use svg

Ensure the default FTP passive settings to false

The default passive setting has been changed between Ruby 2.2 and 2.3

Sources:
Ruby 2.2: https://docs.ruby-lang.org/en/2.2.0/Net/FTP.html - contains no default_passive, only passive set to false by default
Ruby 2.3: https://docs.ruby-lang.org/en/2.3.0/Net/FTP.html - default_passive set to true by default.

Update .travis.yml : support for 2.2 and 2.1 has ended

support for 2.2 and 2.1 has ended 

https://www.ruby-lang.org/en/news/2018/06/20/support-of-ruby-2-2-has-ended/ and 

https://www.ruby-lang.org/en/news/2017/04/01/support-of-ruby-2-1-has-ended/

The default passive setting has been changed between Ruby 2.2 and 2.3

Update nokogiri security update 1.8.1 Released

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* Add integration tests for splitter

* Amend for comments on PR #908

Merge discussed changes.

Docker support for development, with skeleton integration test suite

* Initial integration test with Docker container, GH #807

* Update maintainer

* Update Ruby version

* Add convenience Rake tasks for Docker

* Fix Rubocop issue in Rakefile

* Do not force Docker rebuild every run

Revert "Merge pull request #853 from backup/deprecations"

This reverts commit 51c166d, reversing
changes made to ca5b9d7.

* Fix link on README

* Fix link to maintainer page

Bump `mail` and `nokogiri` dependencies for security updates

`mail` v2.6.6 -- https://github.com/mikel/mail/releases/tag/2.6.6
`nokogiri` v1.7.2 -- https://github.com/sparklemotion/nokogiri/blob/v1.7.2/CHANGELOG.md#172--2017-05-09

The `mail` patch for Exim SMTP support is no longer required as well.