WIP. config accepts custom_field property and checks model for custom fields if it's true. not tested at all.
Can now display custom field data on cards.
No longer need to have custom_field property on config, it just looks on the model to see if it has one.
Updated readme.
Does not show non-existant field labels.
Using current locale to look for custom field names.
Looking through all locales for custom field names.
Merge branch 'dev' into custom-fields-in-config

Conflicts:
	README.md
	lib/open_project/pdf_export/export_card/column_element.rb
Merge pull request #8 from finnlabs/custom-fields-in-config

Custom fields in config