gdss-client >> GH2 - brick_simple:{add,set,replace} APIs do not
return the server-side timstamp for success:
- Application Developer Guide (en)
  * Revision 0.2.6(en)
  * Fix a typo
- Application Developer Guide (ja)
  * Revision 0.2.5(en)
  * Add timestamp() to the return values for add, set, and replace
  * Add exp_time() to the return values for get and get_many
gdss-brick >> GH2 - brick_server new client API - rename:
- Application Developer Guide (en)
  * Change "Gemini QA" in rename/6 section to "Cloudian QA"
- Application Developer Guide (ja)
  * Revision 0.2.6(ja)
  * Add rename/6 section