Removes unnecessary and deprecated RSpec configuration
Adds a formatter for the lines format
Updates specs to RSpec 3 syntax

* Switches from implicit `it` blocks
* General spec tidy ups
* Uses new expectation syntax
Merge pull request #85 from roidrage/rspec-deprecations

RSpec deprecations and tidying
Merge pull request #35 from zimbatm/lines-output

Lines output
Makes specs consistent with style elsewhere
Adds `Lines` formatter to the docs
Merge pull request #86 from roidrage/lines-formatter-tweaks

Lines formatter tweaks
Adds jruby to the build matrix

* Allows failures (for now at least)
Merge pull request #87 from roidrage/travis-jruby

Adds jruby to the build matrix