Version 1.18

New features:

• Parse GetText strings from specified gems (#28). Cf. https://github.com/translation/rails#gems-with-gettext-strings
• Add config.disable_yaml option (#26)
• Add config.text_domain and config.binded_text_domains options for GetText fine-tuning.

Fixes (bugs & defects):

• Deprecation warning for #has_rdoc (Rubygems) (#29)