Fix up casing of keys in CSV DDF options
Merge branch 'master' of github.com:theodi/csvlint.rb into fix-csv-dialect-keys

Conflicts:
	features/step_definitions/csv_options_steps.rb
	features/support/env.rb
Merged up from master, fixed conflicts
Fixed conflicts with master
Merge pull request #35 from theodi/fix-csv-dialect-keys

Fix up casing of keys in CSV DDF options