cpdb-libs 2.0b3

Third beta release for cpdb-libs 2.0.0

• Added functions to fetch all printer strings translations (PR #23)
  • Added cpdbGetAllTranslations() to synchronously fetch all
    printer string translations
  • Added cpdbAcquireTranslations() to asychronously fetch them.
  • Removed get-human-readable-option/choice-name methods
  • Removed cpdb_async_obj_t from cpdb-frontend.h as that is meant
    for internal use.