[evol] work on cyborg server protocol and API #7 (refs #31)
[evol] reorganized TMail extra code, and extra methods in lang_additions
[fix] TMail monkey patch: corrected misplaced 'end', leading to a regression when signing a multipart mail
[evol] added is_numeric? to String
[evol] reorganize TMail extra methods
[fix] check for MIME boundaries better
[fix] workaround a nasty TMail behavior: don't regenerate a new boundary when one already exist to avoid breaking GPG signatures
[licence] updated copyright years and added missing headers
[cleanup] moved base require files in 'lib/cyborghood/base'