Drop ruby 1.8.7 support from master
Fixes #276 - TypeValidator expected_type 'array'

TypeValidator was giving 'string' back as the expeted_type
instead of 'array'
Merge pull request #277 from dustint-rh/arrayvalidator_expectedtype

Fixes #276 - TypeValidator expected_type 'array'
Name substitution for referenced param_group defined in a concern
Merge pull request #280 from tstrachota/concerns

Name substitution for referenced param_groups defined in concerns
Bump version

We're still ruby 1.8.7 compatible
Keep testing 1.8.7 for v0.2.x