Fix rubocop warnings.
Fix gem dependencies.
Update bundled gems.
Update rubocop.
Guard rubocop.
Use flat gemnasium badge.
Integrate with gitter.im
Integrate with codeclimate test coverage.
Set CODECLIMATE_REPO_TOKEN
Update Travis settings.
Use flat gem version badge.
Version bump.
Merge branch 'release/0.4.7'
Merge tag '0.4.7' into develop

0.4.7
Add changelog.
Enable 'Not' cop.
Enable 'EmptyLines' cop.
Enable 'EmptyLinesAroundAccessModifier' cop.
Enable 'EmptyLinesAroundBody' cop.
Enable 'TrailingBlankLines' cop.